Method and apparatus for performing data transmission based on multiple transmission time intervals, for transmitting control information, and for transmitting data by employing multiple ports

ABSTRACT

The disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as long term evolution (LTE). A method for operating a terminal is provided. The method includes detecting, scheduling assignment (SA) of another terminal in a sensing window based on transmission time intervals (TTIs) with different lengths in a resource pool; detecting a receiving power of a scheduled data channel based on the SA and a receiving energy of each sub-channel of each subframe; determining resources for data transmission based on the SA, the receiving power and the receiving energy; and transmitting data on the resources.

TECHNICAL FIELD

This disclosure generally relates to wireless communication system. Morespecifically, this disclosure relates to perform data transmission basedon multiple transmission time intervals (TTIs) in a vehicle tovehicle/pedestrian/infrastructure/network (V2X) system, to transmitcontrol information, and to transmit data on multiple antenna ports in aV2X system.

BACKGROUND ART

To meet the demand for wireless data traffic having increased sincedeployment of 4th generation (4G) communication systems, efforts havebeen made to develop an improved 5th generation (5G) or pre-5Gcommunication system. Therefore, the 5G or pre-5G communication systemis also called a ‘beyond 4G network’ or a ‘post long term evolution(LTE) System’.

The 5G communication system is considered to be implemented in higherfrequency (mmWave) bands, e.g., 28 GHz or 60 GHz bands, so as toaccomplish higher data rates. To decrease propagation loss of the radiowaves and increase the transmission distance, the beamforming, massivemultiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO),array antenna, an analog beam forming, large scale antenna techniquesare discussed in 5G communication systems.

In addition, in 5G communication systems, development for system networkimprovement is under way based on advanced small cells, cloud radioaccess networks (RANs), ultra-dense networks, device-to-device (D2D)communication, wireless backhaul, moving network, cooperativecommunication, coordinated multi-points (CoMP), reception-endinterference cancellation and the like.

In the 5G system, Hybrid frequency shift keying (FSK) and quadratureamplitude modulation (FQAM) and sliding window superposition coding(SWSC) as an advanced coding modulation (ACM), and filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA), and sparse codemultiple access (SCMA) as an advanced access technology have beendeveloped.

DISCLOSURE Technical Problem

Embodiments of the disclosure provide a method and an apparatus forperforming data transmission based on multiple transmission timeintervals (TTIs) in a vehicle tovehicle/pedestrian/infrastructure/network (V2X) system, for transmittingcontrol information, and for transmitting data on multiple antenna portsin a V2X system

Embodiments of the disclosure provide a method and apparatus forperforming data transmission based on multiple TTIs, which provides amapping structure of a sTTI, a configuration policy of resource pool, aresource assignment mechanism and a resource selection process, so as toimprove the transmission performance of UE.

Embodiments of the disclosure provides a method and an apparatus forallocating a physical uplink control channel (PUCCH) resource, whichprovides a mechanism for increasing the utilization rate of the upperlimit resource and reducing the bit overhead of the downlink DCI.

Embodiments of the disclosure provides a method and apparatus fortransmitting data, which provides a mechanism for further reducing thecollision between UEs when the UE performs resource selection and datatransmission, so as to improve the transmission performance of the UE.

Technical Solution

In one embodiment, a method for performing data transmission based onmultiple TTIs is provided. The method includes: sensing, by a userequipment (UE), scheduling assignment (SA) of another UE in a sensingwindow based on TTIs with different lengths in a resource pool,measuring a receiving power of a scheduled data channel based on the SA,and sensing a receiving energy of each sub-channel of each subframe;selecting, by the UE, resources for data transmission according to theSA, the receiving power and the receiving energy; and transmitting, bythe UE, the SA to indicate the selected resources, and performing datatransmission on the resources.

The method further includes: dividing a long TTI (lTTI) into multipleshort TTIs (sTTIs), setting an Automatic Gain Control (AGC) at thebeginning of each sTTI, and setting a GAP at the end of each sTTI,wherein the length of the AGC of each sTTI is equal to the length of theAGC of the lTTI and the length of the GAP of each sTTI is equal to thelength of the GAP of the lTTI; or, the length of the AGC of the firstsTTI is equal to the length of the AGC of the lTTI, the length of theGAP of the last sTTI is equal to the length of the GAP of the lTTI, andthe length of AGC or GAP of each of other sTTIs is shorter than thelength of AGC or GAP of the lTTI, or the lengths of AGC and GAP of eachof other sTTIs are shorter than the lengths of AGC and GAP of the lTTIrespectively.

The method further includes: dividing a lTTI into multiple sTTIs,setting an AGC at the beginning of each sTTI, and setting a GAP at theend of the last sTTI, wherein the length of the GAP of the last sTTI isequal to the length of the GAP of the lTTI and the length of the AGC ofeach sTTI is equal to the length of the AGC of the lTTI, or the AGC ofthe first sTTI is equal to the length of the AGC of the lTTI, and thelengths of AGCs of other sTTIs are all shorter than the length of theAGC of the lTTI.

The method further includes: dividing a lTTI into multiple sTTIs,setting an AGC in the first sTTI, wherein the length of the AGC of thefirst sTTI is equal to the length of the AGC of the lTTI, setting a GAPin the last sTTI, wherein the length of the GAP of the last sTTI isequal to the length of the GAP of the lTTI, and inserting a shorter GAPand AGC between two adjacent sTTIs.

The method further includes: dividing a lTTI into multiple sTTIs,wherein the first and the last orthogonal frequency divisionmultiplexing (OFDM) symbols of each sTTI transmit data on one subcarrierevery N subcarriers, N is a constant.

The resource pool is configured according to a lTTI when the datatransmission is performed based on the TTIs with different lengths; orthe resource pool is configured according to each length of the TTIsrespectively.

Suppose frequency resources occupied by the SA of a sTTI is m timesfrequency resources occupied by a lTTI, the SA resources q+[0,1, . . .m−1] of the lTTI are occupied by the qth SA of the sTTI, q=0,1, . . .M−1, M=N−m+1, and N is the number of data sub-channels of the lTTI.

Suppose frequency resources occupied by the SA of a sTTI is m timesfrequency resources occupied by a lTTI, the SA resources q·m+[0,1, . . .m−1]+Δ1 of the lTTI are occupied by the qth SA of the sTTI, q=0,1, . . .M−1, and M=└N/m┘; and a data sub-channel q·m+[0,1, . . . m−1]+Δ2 of thelTTI is occupied by the qth data sub-channel of the sTTI, Δ1 and Δ2 areparameters related to resource location, and N is the number of datasubchannels of the lTTI.

When receiving SAs of TTIs with different lengths, for the TTIs withdifferent lengths, thresholds of physical sidelink sharechannel-reference signal receiving powers (PSSCH-RSRPs) are different;or the threshold of a PSSCH-RSRP is recorded as Th, it is determinedwhether resources are available through comparing the PSSCH-RSRP withTh+Δ, and Δ is a power adjustment parameter; or it is determined whetherresources are available through comparing PSSCH_RSRP+4 with thethreshold, the PSSCH_RSRP is the receiving power of data channel, and Δis a power adjustment parameter.

When sensing the receiving energy sidelink-received signal strengthindicator (S-RSSI) according to a lTTI, receiving energy of othersymbols except AGC and GAP symbols of the lTTI is sensed; or thereceiving energy of all symbols not used for GAPs is sensed, whereinsymbols not used for GAPs does not include AGC and GAP symbols of thelTTI; or one lTTI resource is divided into multiple sTTI resources, andthe S-RSSI of each sTTI resource are sensed firstly, and the S-RSSI ofthe lTTI resource is obtained according to the S-RSSI of each sTTIresource.

For a sTTI resource, if in a lTTI to which the sTTI resource belongs,other sTTI resources with the same or overlapped frequency location asthe sTTI resource are unavailable, a probability that the UE selects thesTTI resource is increased.

When the number of SAs that can be sensed by the UE is smaller than thetotal number of SAs of multiple TTIs with different lengths in a lTTI,to-be-sensed SA resources are determined according to priorities of theTTIs with different lengths; or when the number of SAs that can besensed by the UE is smaller than the total number of SAs of multipleTTIs with different lengths in a lTTI, the number of SA resources oflTTI to be sensed by the UE and the number of SA resources of sTTI to besensed by the UE are determined respectively.

The number of to-be-sensed physical resource blocks (PRBs) of the TTIswith different lengths is determined according to priorities of the TTIswith different lengths; or the number of PRBs of lTTI to be sensed bythe UE and the number of PRBs of sTTI to be sensed by the UE aredetermined respectively.

In another embodiment, an apparatus for performing data transmissionbased on multiple TTIs is provided. The apparatus includes: a sensingmodule, a resource selecting module and a receiving-transmitting module,wherein the sensing module is applied to a user equipment (UE) to sensescheduling assignment (SA) of another UE in a sensing window based onTTIs with different lengths in a resource pool, measure a receivingpower of a scheduled data channel based on the SA, and sense a receivingenergy of each sub-channel of each subframe; the resource selectingmodule is applied to the UE to select resources for data transmissionaccording to the SA, the receiving power and the receiving energy; andthe receiving-transmitting module is applied to the UE to transmit theSA to indicate the selected resources, and perform data transmission onthe resources.

In yet another embodiment, a method for transmitting control informationis provided, the method includes: detecting, by a user equipment (UE), aphysical downlink control channel (PDCCH) on a configured controlresource set (CORESET); parsing the detected PDCCH, correspondinglyreceiving a physical downlink shared channel (PDSCH), and determiningphysical uplink control channel (PUCCH) resources for feedback of uplinkcontrol information (UCI), by the UE; and transmitting a UCI on thedetermined the PUCCH resources, and a scheduled physical uplink sharedchannel (PUSCH), by the UE.

Preferably, the method further comprises at least one of the followingsteps: determining a starting point of a channel to which a second PUCCHformat is mapped, according to an ending point of a channel to which afirst PUCCH format is mapped; acquiring a parameter N_(RB) ^((2,ref))according to a higher-layer signaling, obtaining a parameter N_(RB) ⁽²⁾according to the number of OFDM symbols (OSs) for PUCCH and the N_(RB)^((2,ref)), and determining a starting physical resource block (PRB) towhich the second PUCCH format is mapped according to the parameter; anddetermining an offset N_(PUCCH) ^(offset) of the PUCCH resources,according to the number of OSs for bearing the PUCCH resources.

Preferably, the step of determining PUCCH resources for feedback of UCI,comprises one of the following: receiving configuration information of NPUCCH resources configured by a higher-layer signaling, and thenadjusting the configured N PUCCH resources according to the number ofOSs for PUCCH, and determining one of the N PUCCH resources as the PUCCHresource for feedback of UCI according to a hybrid automatic repeatrequest acknowledgement (HARQ-ACK) resource indication (ARI); fordifferent number of OSs for bearing PUCCH resources, receivingrespectively the N PUCCH resources configured by a higher-layersignaling, and, obtaining corresponding N PUCCH resources according tothe number of OSs for bearing the PUCCH, and determining one of the NPUCCH resources as the PUCCH resource for feedback of UCI according toan ARI; receiving multiple sets of PUCCH resources configured by ahigher-layer signaling, wherein each set of PUCCH resources includes NPUCCH resources, and determining one PUCCH resource of one set of NPUCCH resources as the PUCCH resource for feedback of UCI according toan ARI; and receiving multiple sets of PUCCH resources configured by ahigher-layer signaling, wherein each set of PUCCH resources includes NPUCCH resources, and determining one PUCCH resource of one set of NPUCCH resources as the PUCCH resource for feedback of UCI by combiningthe number of OSs for bearing the PUCCH and an ARI.

Preferably, when a multiple of PUCCH formats exist, determining thePUCCH resources for each PUCCH format, respectively.

Preferably, when a multiple of PUCCH formats exist, determining theadopted PUCCH format according to the number of bits of UCI and thenumber of OSs for the PUCCH; or, determining the adopted PUCCH formataccording to the number of bits of UCI and the ARI; or, determining theadopted PUCCH format according to the number of bits of UCI, the numberof OSs for bearing the PUCCH and the ARI.

Preferably, the step of determining the PUCCH resources for feedback ofUCI, comprises one of the following: receiving configuration informationof a set of PUCCH resources configured by a higher-layer signaling,adjusting the configured set of PUCCH resources according to the numberof OSs for PUCCH, and determining the adjusted set of PUCCH resources asPUCCH resources for feedback of UCI; and for different number of OSs forbearing the PUCCH resources, receiving a set of PUCCH resourcesconfigured by a high-layer signaling, respectively, and determining aset of PUCCH resources as PUCCH resources for feedback of UCI accordingto the number of OSs for bearing the PUCCH.

Preferably, when a multiple of PUCCH formats exist, determining anadopted PUCCH resource according to the number of bits of UCI and thenumber of OSs for PUCCH, or determining an adopted PUCCH format and anadopted PUCCH resource according to the number of bits of UCI and thenumber of OSs for PUCCH.

Preferably, the number of PRBs unavailable for a frequency hoppingoperation of uplink data channel changes according to the number of OSsfor bearing the PUCCH resources.

Preferably, the number of PRBs unavailable for a frequency hoppingoperation of uplink data channel is: a value configured by ahigher-layer signaling; or, a value configured by a higher-layersignaling, and which is adjusted according to the number of OSs forbearing the PUCCH resources; or, a value configured by a higher-layersignaling according to different number of OSs for bearing the PUCCHresources, respectively.

Preferably, the configured CORESET comprising: configuring theCORESET(s) by distinguishing a downlink control information (DCI)format, respectively; or, for one configured CORESET, furtherconfiguring the borne DCI format(s).

Preferably, the CORESET bearing a fallback DCI format is sparser thanthe CORESET bearing a transmission mode-related DCI format.

Preferably, the step of detecting, by the UE, the PDCCH comprises: for atiming position, adjusting the number of PDCCH blind detections so thatthe total number of blind detections is equal to or close to the allowedmaximum number of blind detections; or, adjusting the number of blinddetections so that the total number of blind detections is equal to orclose to the allowed maximum number of blind detections, only when thetotal number of PDCCH blind detections in one timing position exceedsthe allowed maximum number of blind detections. or, adjusting the numberof blind detections so that the total number of blind detections isequal to or close to the allowed maximum number of blind detections,only when the total number of blind detections in one timing positionexceeds the allowed maximum number of blind detections.

Preferably, the step of adjusting the number of blind detections,comprises one of the following: jointly processing all configured CCs;respectively processing each CC; and jointly processing each set ofCORESETs.

Preferably, in the PDCCH, a joint field is used to indicate a scheduledcarrier and a bandwidth part (BWP); or, in the PDCCH, a joint field isused to indicate a scheduled carrier, a BWP and a time unit (TU).

Preferably, performing power control on the PUCCH and/or the PUSCH whentransmitting the UCI on the determined PUCCH resources and the scheduledPUSCH, wherein, a parameter of power control is configured in one of thefollowing ways: configuring the power control parameter for each BWP,respectively; configuring the power control parameter for each carrier,respectively, wherein each BWP on a carrier uses a same configured powercontrol parameter; and configuring the power control parameter for eachset of BWPs, respectively.

In yet another embodiment, an apparatus for transmitting controlinformation is provided, the apparatus includes: a physical downlinkcontrol channel (PDCCH) detecting and parsing module, a physicaldownlink shared channel (PDSCH) receiving module, a physical uplinkcontrol channel (PUCCH) generating module and a transceiving module,wherein: the PDCCH detecting and parsing module, configured to detect,by the UE, a downlink control information (DCI) for scheduling the PDSCHon a configured control resource set (CORESET), and parse the detectedDCI; the PDSCH receiving module, configured to receive the PDSCHaccording to the detected DCI; the PUCCH generating module, configuredto generate a PUCCH signal to be fed back; and the transceiving moduleis configured to receive a downlink signal from a base station andtransmit a PUCCH signal.

In yet another embodiment, a method for transmitting data with multipleports is provided. The method includes detecting scheduling assignments(SAs) of other user equipment (UEs) by a UE in a time unit (TU),generating demodulation reference signal (DMRS) sequences of datachannels, which are scheduled by the correctly decoded SAs; measuringreference signal received power (RSRP) of the data channels by the UEaccording to the DMRS sequences.

Preferably, the step of generating DMRS sequences of data channelscomprises: generating two DMRS sequences, if one UE occupies two DMRSports, wherein, root sequences and cyclic shifts (CSs) of the two DMRSsequences are the same, orthogonal cover codes (OCCs) of the two DMRSsequences are different.

Preferably, wherein, if the DMRS ports only occupy two OCCs, determiningone OCC which is used for one DMRS port and the other OCC which is usedfor the other DMRS port, according to cyclic redundancy checks (CRCs) ofthe SAs; or, determining OCCs used for the two DMRS according to amapping relation from the OCCs to the DMRS ports.

Preferably, if the DMRS ports use four OCCs, determining a first OCC andapplies the first OCC to one DMRS port according to CRCs of SAs, andapplies a second OCC to the other DMRS port, wherein, the second OCC isthe OCC which is mapped to the first OCC.

Preferably, the step of measuring RSRP of data channels comprises:measuring RSRP in each DMRS symbol in one TU respectively, and obtainingRSRP of the whole TU according to the RSRP of each DMRS symbol.

Preferably, the step of generating DMRS sequences of data channelscomprises one of the followings: if multiple DMRS ports occupied by oneUE employ the same CS and different OCCs determining the OCCs accordingto bits in a subset Y of X, wherein, Y includes one or more bits, thebits in Y are also used for determining the CS simultaneously, and X isthe information used for generating the DMRS sequence; if multiple DMRSports occupied by one UE employ the same OCC and different CSs,determining the CSs according to bits in a subset Y of X, wherein, Yincludes one or more bits, the bits of Y are used for determining theOCC simultaneously; or if multiple DMRS ports occupied by one UE employdifferent OCCs and different CSs, the bits in a subset Y of X being onlyused for determining the CS or only used for determining the OCC,wherein, Y includes one or more bits.

In yet another embodiment, an apparatus for transmitting data byemploying multiple ports is provided. The apparatus includes: ademodulation reference signal (DMRS) generating module and a referencesignal received power (RSRP) measuring module, wherein, the DMRSgenerating module is configured for detecting scheduling assignments(SAs) of other user equipment (UEs) by a UE in a time unit (TU),generating DMRS sequences of data channels, which are scheduled by thecorrectly decoded SAs; and the RSRP measuring module is configured formeasuring RSRP of the data channels by the UE according to the DMRSsequences.

Preferably, wherein, if one UE occupies two DMRS ports, the DMRSgenerating module is configured for generating two DMRS sequences,wherein, root sequences and cyclic shifts (CSs) of the two DMRSsequences are the same, orthogonal cover codes (OCCs) of the two DMRSsequences are different.

Preferably, wherein, if the DMRS ports only use four OCCs, the DMRSgenerating module is configured for determining a first OCC and applyingthe first OCC to one DMRS port, and applying a second OCC to the otherDMRS port according to cyclic redundancy checks (CRCs) of the SAs,wherein, the second OCC is the OCC which is mapped to the first OCC.

Preferably, wherein, if the DMRS ports use only two OCCs, the DMRSgenerating module is configured for determining one OCC which is usedfor one DMRS port and the other OCC which is used for the other DMRSport, according to cyclic redundancy checks (CRCs) of the SAs; or,determining OCCs used for the two DMRS, according to a mapping relationfrom the OCCs to the DMRS ports.

In yet another embodiment, a method for operating a terminal isprovided. The method includes detecting, scheduling assignment (SA) ofanother terminal in a sensing window based on transmission timeintervals (TTIs) with different lengths in a resource pool; detecting areceiving power of a scheduled data channel based on the SA and areceiving energy of each sub-channel of each subframe; determiningresources for data transmission based on the SA, the receiving power andthe receiving energy; and transmitting data on the resources.

In yet another embodiment, a method for operating a terminal isprovided. The method includes detecting a physical downlink controlchannel (PDCCH) on a configured control resource set (CORESET);receiving a physical downlink shared channel (PDSCH) by parsing thedetected PDCCH; determining physical uplink control channel (PUCCH)resources for feedback of uplink control information (UCI); andtransmitting the UCI on the determined the PUCCH resources, and ascheduled physical uplink shared channel (PUSCH).

In yet another embodiment, a method for operating a terminal isprovided. The method includes detecting scheduling assignments (SAs) ofother terminals in a time unit (TU), generating demodulation referencesignal (DMRS) sequences of data channels, which are scheduled by decodedSAs; and detecting reference signal received power (RSRP) of the datachannels based on the DMRS sequences.

Advantageous Effects

A method and an apparatus according to various embodiments of thedisclosure allows the conflict between UEs adopting TTIs with differentlengths can be avoided as possible, the resource utilization can beimproved, and transmission performance of TTIs with different lengthscan be ensured.

With the method of the disclosure, a method for allocating PUCCHresources is provided to improve the utilization rate of upper limitresources. A method for indicating PUCCH resources in DCI is provided toreduce the bit overhead of DCI.

By employing the method of the disclosure, the interference caused bycollision of UEs is avoided as much as possible, especially UE collisionis avoided when the UE is not transmitting on one or more reservedresources, so as to improve the reliability of data transmission.

DESCRIPTION OF DRAWINGS

FIG. 1 illustrates a wireless communication system according to variousembodiments of the disclosure.

FIG. 2 illustrates the BS in the wireless communication system accordingto various embodiments of the disclosure.

FIG. 3 illustrates the terminal in the wireless communication systemaccording to various embodiments of the disclosure.

FIG. 4 illustrates the communication interface in the wirelesscommunication system according to various embodiments of the disclosure.

FIG. 5 is a diagram illustrating resource selection based on sensing.

FIG. 6 is a flowchart illustrating resource selection based on sensing;

FIG. 7 is a flowchart of the disclosure.

FIG. 8 is a diagram illustrating the structure of a sTTI.

FIG. 9 is a diagram illustrating the SA resources and data channels ofsTTI.

FIG. 10 is a diagram illustrating the SA resources and data channels ofsTTI.

FIG. 11 is a diagram illustrating resource selection according toembodiments of the disclosure.

FIG. 12 is a diagram illustrating an apparatus according to embodimentsof the disclosure.

FIG. 13 is a diagram illustrating a process of using half OFDM symbol asAGC.

FIG. 14 is a diagram illustrating a process of using half OFDM symbol asGAP.

FIG. 15 is a diagram illustrating a mapping process of using half OFDMsymbol as data channels of AGC and GAP.

FIG. 16 shows a frame structure of the LTE system.

FIG. 17 is a flowchart according to the present invention.

FIG. 18 is a schematic diagram of resource allocations for two PUCCHformats.

FIG. 19 is a schematic diagram of a frequency hopping operation of anuplink data channel according to the present invention.

FIG. 20 is a schematic diagram of configuring DCI format and CORESETaccording to the present invention.

FIG. 21 is a block diagram of an apparatus according to the presentinvention.

FIG. 22 is a flowchart of the present invention.

FIG. 23 is a schematic diagram of distinguishing the DMRS ports based onOCC according to the present invention.

FIG. 24 is a first schematic diagram of generating the DMRS sequenceaccording to the present invention.

FIG. 25 is a second schematic diagram of generating the DMRS sequenceaccording to the present invention.

FIG. 26 is a schematic diagram of a device according to the presentinvention.

BEST MODE

Hereinafter, in various embodiments of the disclosure, hardwareapproaches will be described as an example. However, various embodimentsof the disclosure include a technology that uses both hardware andsoftware and thus, the various embodiments of the disclosure may notexclude the perspective of software.

In order to make the object, technical solution and merits of thedisclosure clearer, the disclosure will be illustrated in detailhereinafter with reference to the accompanying drawings and specificembodiments.

Hereinafter, the disclosure describes technology for performing datatransmission based on multiple transmission time intervals, fortransmitting control information, and for transmitting data by employingmultiple ports in a wireless communication system.

The terms referring to scheduling assignment (SA), the terms referringto a signal, the terms referring to a channel, the terms referring tocontrol information, the terms referring to a network entity, and theterms referring to elements of a device used in the followingdescription are used only for convenience of the description.Accordingly, the disclosure is not limited to the following terms, andother terms having the same technical meaning may be used.

Further, although the disclosure describes various embodiments based onthe terms used in some communication standards (for example, 3rdGeneration Partnership Project (3GPP)), they are only examples for thedescription. Various embodiments of the disclosure may be easilymodified and applied to other communication systems.

FIG. 1 illustrates a wireless communication system according to variousembodiments of the disclosure. In FIG. 1, a base station (BS) 110, aterminal 120, and a terminal 130 are illustrated as the part of nodesusing a wireless channel in a wireless communication system. FIG. 1illustrates only one BS, but another BS, which is the same as or similarto the BS 110, may be further included.

The BS 110 is network infrastructure that provides wireless access tothe terminals 120 and 130. The BS 110 has coverage defined as apredetermined geographical region based on the distance at which asignal can be transmitted. The BS 110 may be referred to as “accesspoint (AP),” “eNodeB (eNB),” “5th generation (5G) node,” “wirelesspoint,” “transmission/reception Point (TRP)” as well as “base station.”

Each of the terminals 120 and 130 is a device used by a user, andperforms communication with the BS 110 through a wireless channel.Depending on the case, at least one of the terminals 120 and 130 mayoperate without user involvement. That is, at least one of the terminals120 and 130 is a device that performs machine-type communication (MTC)and may not be carried by the user. Each of the terminals 120 and 130may be referred to as “user equipment (UE),” “mobile station,”“subscriber station,” “remote terminal,” “wireless terminal,” or “userdevice” as well as “terminal.”

The BS 110, the terminal 120, and the terminal 130 may transmit andreceive wireless signals in millimeter wave (mmWave) bands (for example,28 GHz, 30 GHz, 38 GHz, and 60 GHz). At this time, in order to improve achannel gain, the BS 110, the terminal 120, and the terminal 130 mayperform beamforming. The beamforming may include transmissionbeamforming and reception beamforming. That is, the BS 110, the terminal120, and the terminal 130 may assign directivity to a transmissionsignal and a reception signal. To this end, the BS 110 and the terminals120 and 130 may select serving beams 112, 113, 121, and 131 through abeam search procedure or a beam management procedure. After that,communications may be performed using resources having a quasico-located relationship with resources carrying the serving beams 112,113, 121, and 131.

A first antenna port and a second antenna ports are considered to bequasi co-located if the large-scale properties of the channel over whicha symbol on the first antenna port is conveyed can be inferred from thechannel over which a symbol on the second antenna port is conveyed. Thelarge-scale properties may include one or more of delay spread, dopplerspread, doppler shift, average gain, average delay, and spatial Rxparameters.

FIG. 2 illustrates the BS in the wireless communication system accordingto various embodiments of the disclosure. A structure exemplified atFIG. 2 may be understood as a structure of the BS 110. The term“-module”, “-unit” or “-er” used hereinafter may refer to the unit forprocessing at least one function or operation and may be implemented inhardware, software, or a combination of hardware and software.

Referring to FIG. 2, the BS may include a wireless communicationinterface 210, a backhaul communication interface 220, a storage unit230, and a controller 240.

The wireless communication interface 210 performs functions fortransmitting and receiving signals through a wireless channel. Forexample, the wireless communication interface 210 may perform a functionof conversion between a baseband signal and bitstreams according to aphysical layer standard of the system. For example, in datatransmission, the wireless communication interface 210 generates complexsymbols by encoding and modulating transmission bitstreams. Further, indata reception, the wireless communication interface 210 reconstructsreception bitstreams by demodulating and decoding the baseband signal.

In addition, the wireless communication interface 210 up-converts thebaseband signal into an radio frequency (RF) band signal, transmits theconverted signal through an antenna, and then down-converts the RF bandsignal received through the antenna into the baseband signal. To thisend, the wireless communication interface 210 may include a transmissionfilter, a reception filter, an amplifier, a mixer, an oscillator, adigital-to-analog convertor (DAC), an analog-to-digital convertor (ADC),and the like. Further, the wireless communication interface 210 mayinclude a plurality of transmission/reception paths. In addition, thewireless communication interface 210 may include at least one antennaarray consisting of a plurality of antenna elements.

On the hardware side, the wireless communication interface 210 mayinclude a digital unit and an analog unit, and the analog unit mayinclude a plurality of sub-units according to operation power, operationfrequency, and the like. The digital unit may be implemented as at leastone processor (e.g., a digital signal processor (DSP)).

The wireless communication interface 210 transmits and receives thesignal as described above. Accordingly, the wireless communicationinterface 210 may be referred to as a “transmitter” a “receiver,” or a“transceiver.” Further, in the following description, transmission andreception performed through the wireless channel may be used to have ameaning including the processing performed by the wireless communicationinterface 210 as described above.

The backhaul communication interface 220 provides an interface forperforming communication with other nodes within the network. That is,the backhaul communication interface 220 converts bitstreams transmittedto another node, for example, another access node, another BS, a highernode, or a core network, from the BS into a physical signal and convertsthe physical signal received from the other node into the bitstreams.

The storage unit 230 stores a basic program, an application, and datasuch as setting information for the operation of the BS 110. The storageunit 230 may include a volatile memory, a non-volatile memory, or acombination of volatile memory and non-volatile memory. Further, thestorage unit 230 provides stored data in response to a request from thecontroller 240.

The controller 240 controls the general operation of the BS. Forexample, the controller 240 transmits and receives a signal through thewireless communication interface 210 or the backhaul communicationinterface 220. Further, the controller 240 records data in the storageunit 230 and reads the recorded data. The controller 240 may performsfunctions of a protocol stack that is required from a communicationstandard. According to another implementation, the protocol stack may beincluded in the wireless communication interface 210. To this end, thecontroller 240 may include at least one processor.

According to exemplary embodiments of the disclosure, the controller 240may control the base station to perform operations according to theexemplary embodiments of the disclosure.

FIG. 3 illustrates the terminal in the wireless communication systemaccording to various embodiments of the disclosure. A structureexemplified at FIG. 3 may be understood as a structure of the terminal120 or the terminal 130. The term “-module”, “-unit” or “-er” usedhereinafter may refer to the unit for processing at least one functionor operation, and may be implemented in hardware, software, or acombination of hardware and software.

Referring to FIG. 3, the terminal 120 includes a communication interface310, a storage unit 320, and a controller 330.

The communication interface 310 performs functions fortransmitting/receiving a signal through a wireless channel. For example,the communication interface 310 performs a function of conversionbetween a baseband signal and bitstreams according to the physical layerstandard of the system. For example, in data transmission, thecommunication interface 310 generates complex symbols by encoding andmodulating transmission bitstreams. Also, in data reception, thecommunication interface 310 reconstructs reception bitstreams bydemodulating and decoding the baseband signal. In addition, thecommunication interface 310 up-converts the baseband signal into an RFband signal, transmits the converted signal through an antenna, and thendown-converts the RF band signal received through the antenna into thebaseband signal. For example, the communication interface 310 mayinclude a transmission filter, a reception filter, an amplifier, amixer, an oscillator, a DAC, and an ADC.

Further, the communication interface 310 may include a plurality oftransmission/reception paths. In addition, the communication interface310 may include at least one antenna array consisting of a plurality ofantenna elements. In the hardware side, the wireless communicationinterface 210 may include a digital circuit and an analog circuit (forexample, a radio frequency integrated circuit (RFIC)). The digitalcircuit and the analog circuit may be implemented as one package. Thedigital circuit may be implemented as at least one processor (e.g., aDSP). The communication interface 310 may include a plurality of RFchains. The communication interface 310 may perform beamforming.

The communication interface 310 transmits and receives the signal asdescribed above. Accordingly, the communication interface 310 may bereferred to as a “transmitter,” a “receiver,” or a “transceiver.”Further, in the following description, transmission and receptionperformed through the wireless channel is used to have a meaningincluding the processing performed by the communication interface 310 asdescribed above.

The storage unit 320 stores a basic program, an application, and datasuch as setting information for the operation of the terminal 120. Thestorage unit 320 may include a volatile memory, a non-volatile memory,or a combination of volatile memory and non-volatile memory. Further,the storage unit 320 provides stored data in response to a request fromthe controller 330.

The controller 330 controls the general operation of the terminal 120.For example, the controller 330 transmits and receives a signal throughthe communication interface 310. Further, the controller 330 recordsdata in the storage unit 320 and reads the recorded data. The controller330 may performs functions of a protocol stack that is required from acommunication standard. According to another implementation, theprotocol stack may be included in the communication interface 310. Tothis end, the controller 330 may include at least one processor ormicroprocessor, or may play the part of the processor. Further, the partof the communication interface 310 or the controller 330 may be referredto as a communication processor (CP).

According to exemplary embodiments of the disclosure, the controller 330may detect, scheduling assignment (SA) of another terminal in a sensingwindow based on transmission time intervals (TTIs) with differentlengths in a resource pool; detect a receiving power of a scheduled datachannel based on the SA and a receiving energy of each sub-channel ofeach subframe; determine resources for data transmission based on theSA, the receiving power and the receiving energy; and transmit data onthe resources. Further, the controller 330 may detect a physicaldownlink control channel (PDCCH) on a configured control resource set(CORESET); receive a physical downlink shared channel (PDSCH) by parsingthe detected PDCCH; determine physical uplink control channel (PUCCH)resources for feedback of uplink control information (UCI); and transmitthe UCI on the determined the PUCCH resources, and a scheduled physicaluplink shared channel (PUSCH). Further, the controller 330 may detectscheduling assignments (SAs) of other terminals in a time unit (TU),generate demodulation reference signal (DMRS) sequences of data channelsbased on the SAs; and detect reference signal received power (RSRP) ofthe data channels based on the DMRS sequences. For example, thecontroller 330 may control the terminal to perform operations accordingto the exemplary embodiments of the disclosure.

FIG. 4 illustrates the communication interface in the wirelesscommunication system according to various embodiments of the disclosure.FIG. 4 shows an example for the detailed configuration of thecommunication interface 210 of FIG. 2 or the communication interface 310of FIG. 3. More specifically, FIG. 4 shows elements for performingbeamforming as part of the communication interface 210 of FIG. 2 or thecommunication interface 310 of FIG. 3.

Referring to FIG. 4, the communication interface 210 or 310 includes anencoding and circuitry 402, a digital circuitry 404, a plurality oftransmission paths 406-1 to 406-N, and an analog circuitry 408.

The encoding and circuitry 402 performs channel encoding. For thechannel encoding, at least one of a low-density parity check (LDPC)code, a convolution code, and a polar code may be used. The encoding andcircuitry 402 generates modulation symbols by performing constellationmapping.

The digital circuitry 404 performs beamforming for a digital signal (forexample, modulation symbols). To this end, the digital circuitry 404multiples the modulation symbols by beamforming weighted values. Thebeamforming weighted values may be used for changing the size and phraseof the signal, and may be referred to as a “precoding matrix” or a“precoder.” The digital circuitry 404 outputs the digitally beamformedmodulation symbols to the plurality of transmission paths 406-1 to406-N. At this time, according to a multiple input multiple output(MIMO) transmission scheme, the modulation symbols may be multiplexed,or the same modulation symbols may be provided to the plurality oftransmission paths 406-1 to 406-N.

The plurality of transmission paths 406-1 to 406-N convert the digitallybeamformed digital signals into analog signals. To this end, each of theplurality of transmission paths 406-1 to 406-N may include an inversefast fourier transform (IFFT) calculation unit, a cyclic prefix (CP)insertion unit, a DAC, and an up-conversion unit. The CP insertion unitis for an orthogonal frequency division multiplexing (OFDM) scheme, andmay be omitted when another physical layer scheme (for example, a filterbank multi-carrier: FBMC) is applied. That is, the plurality oftransmission paths 406-1 to 406-N provide independent signal processingprocesses for a plurality of streams generated through the digitalbeamforming. However, depending on the implementation, some of theelements of the plurality of transmission paths 406-1 to 406-N may beused in common.

The analog circuitry 408 performs beamforming for analog signals. Tothis end, the digital circuitry 404 multiples the analog signals bybeamforming weighted values. The beamformed weighted values are used forchanging the size and phrase of the signal. More specifically, accordingto a connection structure between the plurality of transmission paths406-1 to 406-N and antennas, the analog circuitry 408 may be configuredin various ways. For example, each of the plurality of transmissionpaths 406-1 to 406-N may be connected to one antenna array. In anotherexample, the plurality of transmission paths 406-1 to 406-N may beconnected to one antenna array. In still another example, the pluralityof transmission paths 406-1 to 406-N may be adaptively connected to oneantenna array, or may be connected to two or more antenna arrays.

In a V2X system based on long term evolution (LTE) of 3GPP, there aretwo structures for configuring a physical sidelink control channel(PSCCH) resource pool and a physical sidelink share channel (PSSCH)resource pool. The PSCCH and a PSSCH scheduled by it may belong to thesame subframe, or the PSCCH and any PSSCH scheduled by it do not belongto the same subframe. The PSCCH resource pool and the PSSCH resourcepool occupy the same subframe set. One PSCCH is mapped to two physicalresource blocks (PRBs) changelessly. The assignment granularity offrequency resources is sub-channel. One sub-channel includes continuousPRBs, and the number of the PRBs is configured by high layer signalings.Resources needed by one user equipment (UE) may occupy one or morecontinuous sub-channels. When the PSCCH and the PSSCH belong to the samesubframe, the PSCCH and the PSSCH may occupy continuous PRBs. In the oneor more sub-channels occupied by the resources needed by one UE, twoPRBs, for example, two PRBs with the lowest frequencies, are used tobear the PSCCH, and other PRBs are used to bear the PSSCH. The number ofPRBs actually occupied by the PSSCH needs to meet must be the power of2, 3 and 5. When the PSCCH and the PSSCH belong to the same subframe,the PRBs occupied by the PSCCH and the PRBs occupied by the PSSCH may beuncontinuous. In this case, the starting position of the PRBs of thePSCCH resource pool and the starting position of the PRBs of the PSSCHresource pool may be configured respectively. In the PSSCH resourcepool, resources may be assigned with the granularity of sub-channel. Fora UE, the index of the PSCCH occupied by it is the same as the index ofthe smallest sub-channel of the PSSCH occupied by it.

In the V2X system, a collision problem and an intra-band leakage problemmay be solved based on sensing. Here, suppose a UE occupies resourcesbased on semi-persistent scheduling (SPS), that is, the UE occupies theresources periodically during a period of time. As shown in FIG. 5,suppose the time of selecting PSCCH/PSSCH resources by the UE issubframe n, the UE first senses resources in a resource pool during aperiod of time from subframe n-a to subframe n-b, determines whichtime-frequency resources are occupied and which time-frequency resourcesare idle, and then selects the PSCCH/PSSCH resources in subframe n.Suppose the PSCCH is transmitted in subframe n+c, the PSSCH istransmitted in subframe n+d, and reserved resources are in subframe n+e.Afterwards, the PSCCH is transmitted in subframe n+c, the PSSCH istransmitted in subframe n+d, and the reserved resources is used totransmit the next PSSCH in subframe n+e. When c is equal to d, the PSCCHand the PSSCH belong to the same subframe. An interval between subframen+e and subframe n+d is equal to a reservation interval P. Thereservation interval P is equal to Pstep·k, for example, Pstep=100,i.e., supports a delay not larger than about 100 ms. The range of k maybe a set including all integers from 1 to 10 or a subset of the set. Therange of k may be configured by a higher layer. When performing resourceselection, the UE may select K resources belonging to differentsubframes, i.e., each piece of data may be transmitted repeatedly for Ktimes, wherein K is larger than or equal to 1, for example, K=2, so asto avoid that some UEs are unable to receive the data because of thelimitation of half duplex operations. When K is larger than 1, eachPSSCH may indicate all the K resources.

FIG. 6 is a flowchart illustrating resource selection based on sensing.Suppose resource selection is performed in subframe n, a reservationinterval of currently reserved resources of user equipment (UE) is PA,and the number of cycles during which resources need to be reserved isC. The UE may select resources within a selection window [n+T1, n+T2]and continuously reserve the resources for C cycles with the reservationinterval PA. T1 and T2 depend on the implementation of the UE, forexample, T1≤4 and 20≤T2≤100. T1 depends on the influence of a delay fromselecting resources by the UE to transmitting scheduling assignment (SA)signalings and data, and T2 depends on a delay that a current servicecan tolerate. First, it may be set that all resources within theselection window are in a set SA (601). Afterwards, according to anaccurately received SA, suppose the SA indicates that the resourcescontinue to be reserved after a subframe n, the receiving power of adata channel scheduled by the SA is measured, and when the receivingpower exceeds a threshold, part of candidate resources of SA areexcluded (602). Specifically, when the receiving power exceeds thethreshold, resource Y reserved after the subframe n according to the SAis unavailable. The threshold is determined according to the priority ofthe UE performing resource selection and the priority indicated by theaccurately received SA. Suppose Rx,y represents a single-subframeresource within the selection window [n+T1, n+T2] and Rx,y belongs to asubframe y and contains one or more continuous sub-channels beginningfrom a sub-channel x. When the PRB of R_(x,y+jP) _(A) overlaps with thePRB of the subframe Y, Rx,y is unavailable for UE A, i.e., Rx,y isexcluded from the set SA, wherein j=0,1, . . . C−1, and C is the numberof cycles during which the UE A needs to reserve resources according tothe reservation interval PA. Afterwards, it is determined whether theremained resources of SA reach a ratio R of total resources, forexample, 20% (603). If the ratio of the remained resources is smallerthan R, the threshold is increased by 3 dB (204) and block 601 isperformed again; otherwise, block 605 is performed. At block 605, thereceiving energy of the remained resources of the SA is estimated, andthe resources with minimum receiving energy is moved to a set SB untilthe ratio of resources of SB reaches R. For a resource containingmultiple sub-channels, the receiving energy of the resource is anaverage of receiving energies of all sub-channels contained in theresource. Afterwards, resources for data transmission are selected fromthe resources of SB (606) and data transmission is performed on theselected resources (607). When a piece of data is transmitted for twotimes, the UE first selects a resource for data transmission from SB,and then selects another resource for data transmission within a rangeindicated by the SA when delay requirements are met and availableresources exist.

In order to improve the performance of the V2X system, one solution isto adopt a shorter TTI. A short TTI (sTTI) helps to decrease thetransmission delay, and helps to avoid a problem that data of other UEcannot be received because of half duplex operations. A to-be-solvedproblem is how to effectively support data transmission of a UE onmultiple carriers.

In a wireless communication system, a downlink transmission refers to asignal transmission from a base station to a user equipment (UE).Downlink signals comprise data signals, control signals and referencesignals (pilot frequency). Here, the base station transmits downlinkdata in a physical downlink shared channel (PDSCH), or transmitsdownlink control information in a downlink control channel. An uplinktransmission refers to a signal transmission from a UE to a basestation. Uplink signals also comprise data signals, control signals andreference signals. Here, the UE transmits uplink data in a physicaluplink shared channel (PUSCH), or transmits uplink control informationin a physical uplink control channel (PUCCH). The base station candynamically schedule PDSCH transmission and PUSCH transmission of the UEthrough a physical downlink control channel (PDCCH).

In the 3GPP LTE system, as shown in FIG. 16, each radio frame has alength of 10 ms and is equally divided into 10 sub-frames. Each downlinksubframe comprises two slots; each slot includes 7 OFDM symbols for acommon cyclic prefix (CP) length. A granularity for resources allocationis a physical resource block (PRB). One PRB includes 12 contiguoussubcarriers in frequency and corresponds to one slot in time. A resourceelement (RE) is the smallest unit of time-frequency resources, that is,the RE is one subcarrier in frequency and one OFDM symbol in time.

In the LTE system, the DCIs transmitted to different UEs or DCIs fordifferent functions are independently encoded and transmitted. Whenphysical resource mapping is performed on the PDCCH, a control channelelement (CCE) is used as a unit, that is, a modulation symbol of onePDCCH can be mapped to L CCEs, wherein L is equal to 1, 2, 4 or 8, and Lis also called as an aggregation level of PDCCH. In the LTE system, theUE is configured to detect PDCCHs on a multiple of possible positions,which is called search space of the UE. The base station transmits aPDCCH to this UE on a position in the search space which the UE isconfigured to detect, and the UE obtains the control informationtransmitted by the base station through a blind detection in the searchspace configured by the base station. For HARQ-based downlink datatransmission, after the UE detects the PDCCH and receives the PDSCHcorrespondingly, corresponding HARQ-ACK information can be fed back onthe PUCCH.

The 3GPP standards organization is standardizing the new radio accessnetwork technology (NR), which is still an OFDM-based system. Therefore,how to effectively support the uplink and downlink control channeltransmission is a problem to be solved.

In a V2X (vehicle to vehicle/pedestrian/infrastructure/network) systembased on a long term evolution (LTE) of standardization organizations of3GPP, a UE firstly transmits a physical sidelink control channel (PSCCH)to indicate information, such as a time-frequency resource occupied by adata channel, a modulation and coding scheme (MCS); next, the UEtransmits data on a physical sidelink shared channel (PSSCH) scheduledby the PSCCH. For a LTE D2D/V2X system, a channel for transmitting aScheduling Assignment (SA) is also called PSCCH, and the data channel isalso called PSSCH. The assignment granularity of frequency resources isa sub-channel, wherein a sub-channel includes continuous physicalresource blocks (PRBs), and the number of PRBs is configured byhigher-layer signaling. One or more continuous sub-channels can beoccupied by resources of a device.

For a UE, the device can reserve resources periodically according to acertain reserved interval since its data is basically periodicallygenerated for a period of time; and each data can be transmittedrepeatedly for K times, and correspondingly K resources need to bereserved, wherein K is greater than or equal to 1, so as to avoid thatpart of the devices cannot receive this data due to the restriction ofhalf-duplex operation. The UE can select K resources which can beoccupied by the UE and reserve C continuous cycles according to thedetection information within a detection window. A method for detectingresources is to obtain the PSSCH scheduled by the above PSCCH based onthe decoding on the PSCCHs of other UEs, so that the received power,i.e., PSSCH-reference signal received power (PSSCH-RSRP) correspondingto the UE can be measured, so as to decide the resource occupationand/or the resource reservation based on the received power and thereserved interval in PSCCH. Another method for detecting resource is todeciding resource occupation and/or resource reservation based on areceived energy, i.e., sidelink received signal strength indication(S-RSSI). For a resource on subframe x within a selection window, theabove received energy refers to the average value of the received energyof the same sub-channel resources on the subframe x-Prsvp·j within thedetection window, wherein, Prsvp in the reservation interval, forexample, j is an arbitrary integer. By combining the above two methods,it can be avoided that the transmission of the device occupies the sameresources as that of other devices as much as possible.

In the V2X system in the version 14 of the LTE, the UE (hereafterreferred to as an R14 UE) transmits the PSCCH and PSSCH through a singleantenna port. For the UE configured with multiple antennas, theperformance of the V2X system can be furtherly enhanced based on atransmit diversity technology. However, for the UE employing thetransmit diversity technology employing the two ports, the R14 UE canonly measure the PSSCH-RSRP according to one antenna port, resulting inthat the measured PSSCH-RSRP can be smaller than the actual PSSCH-RSRPby 3 dB. The deviation of the value of the measurements of thePSSCH-RSRP can affect the performance of a resource selection algorithmbased on the PSSCH-RSRP. How to further enhance the V2X technology is anurgent problem to be solved if the transmit diversity technology iseffectively supported.

In V2X communication, there are a plurality of types of UEs, forexample, a vehicle UE (VUE), a pedestrian UE (PUE) and a road-side UE(RSU). The data transmission mechanism of a UE is described as follows.The UE transmits a control channel to indicate such information astime-frequency resources occupied by a data channel and a modulation andcoding scheme (MCS), which is called a SA signaling hereinafter.Afterwards, the UE transmits data on the scheduled data channel. For aLTE D2D/V2X system, the SA is also called a PSCCH, and the data channelis also called a PSSCH. For a UE, since its data is generatedperiodically during a period of time, the UE may reserve resourcesperiodically according to a reservation interval. Each piece of data maybe transmitted repeatedly for K times, and correspondingly, K resourcesneed to be reserved, wherein K is larger than or equal to 1, so as toavoid that some UEs are unable to receive the data because of thelimitation of half duplex operations.

Suppose multiple TTIs with different lengths are adopted, the longestTTI is called lTTI, other TTIs are called sTTIs, and the sTTIs may haveone or more lengths. One lTTI may be divided into multiple sTTIs. ThesTTI helps to decrease a data transmission delay, especially isapplicable to some services requiring a stricter delay. In a resourcepool, a TTI of one length may be used, for example, a lTTI or a sTTI.Or, data transmission based on the lTTI and the sTTI may exist at thesame time. Preferably, the SA and the data channel of a UE use a TTIwith the same length.

FIG. 7 is a flowchart illustrating a method supporting multiple TTIswith different lengths according to the embodiments of the disclosure.The method includes following blocks.

At block 701, a UE senses SA of another UE in a sensing window based onTTIs with different lengths in a resource pool, and measures a receivingpower of a scheduled data channel based on the SA, and senses areceiving energy of each sub-channel of each subframe.

When sensing the receiving power and the receiving energy, the influenceof coexistence of multiple TTIs with different lengths should beconsidered.

At block 702, the UE selects resources for data transmission based onthe SA, the receiving power and the receiving energy.

During the resource selection, the influence between UEs adopting TTIswith different lengths should be avoided as possible, so as to improvethe coexistence performance.

At block 703, the UE transmits the SA to indicate the selectedresources, and performs data transmission on the resources.

For multiple sTTI obtained through dividing a lTTI, each sTTI containsAGC symbol(s), demodulation reference signals (DMRSs) and data symbols,and GAP symbol(s). The AGC symbol is used to adjust an operating pointby a receiving end, and may transmit data or may not transmit data. TheGAP symbol is a time interval used for receiving-transmitting switchingtime of the UE, so as to avoid the overlap of V2X signals and cellularnetwork signals and the overlap of V2X signals.

Further, the disclosure provides various embodiments to illustrate themethod supporting multiple TTIs with different lengths.

A first embodiment is described as follows.

In an actual communication application, it is difficult to learn thetype of UE and the distribution of services in advance. For example, itis difficult to learn the type of UE and the distribution of servicesaccording to the service amount in a lTTI and the service amount in asTTI. Accordingly, data transmission supporting both the lTTI and thesTTI in the same resource pool needs to be considered.

FIG. 8(a) shows the structure of a lTTI. The first OFDM symbol of thelTTI is used for AGC, so data on the first OFDM symbol may not be usedfor decoding. The last OFDM symbol of the lTTI is punctured, and can beused to generate the receiving-transmitting switching time of the UE asa GAP. When multiplexing V2X and cellular network communication on onecarrier, the last OFDM symbol may avoid the overlap of V2X signals andcellular network signals, and avoid the overlap of V2X signals ofdifferent UEs. For example, the structure of V2X subframe in LTE version14 adopts the structure of the lTTI shown in FIG. 8(a).

One lTTI may be further divided into two or more sTTIs. The length ofAGC and GAP needed by the UE supporting the sTTI may be the same as thelength of AGC and GAP needed by the UE only supporting the lTTI. Or,since the delay is more stricted for the UE supporting the sTTI, theprocessing capability of the UE for the AGC and the GAP may be improvedcorrespondingly. Accordingly, the length of AGC and GAP may beshortened. In addition, suppose the transmission of the cellular networkadopts the lTTI, the transmission overlap with the cellular network doesnot exist except the last sTTI.

As shown in FIG. 8(b), an AGC may be set at the beginning of each sTTI,and a GAP is set at the end of each the sTTI. The length of the AGC ofeach sTTI is equal to that of the lTTI and the length of the GAP of eachsTTI is equal to that of the lTTI. Or, the length of the AGC of thefirst sTTI is equal to that of the lTTI, the length of the GAP of thelast sTTI is equal to that of the lTTI, and the length of AGC or GAP ofeach of other sTTIs is shorter than the length of AGC or GAP of thelTTI, or the lengths of AGC and GAP of each of other sTTIs are shorterthan that of the lTTI respectively. For example, the AGC of the firstsTTI and the GAP of the last sTTI may include multiple OFDM symbols, andthe AGC or the GAP of each of other sTTIs only include one OFDM symbolor both AGC and GAP of each of other sTTIs include one OFDM symbolrespectively. The GAP may be used as the receiving-transmittingswitching time of the UE, and may avoid the overlap of V2X signals ofdifferent UEs. Since the GAP is introduced, the receiving-transmittingoperations of the UE in one sTTI do not influence thereceiving-transmitting operations of the UE in the next sTTI. However,this method will cause larger overhead of the AGC and the GAP.

As shown in FIG. 8(c), an AGC may be set at the beginning of each sTTI,and a GAP is set at the end of the last sTTI. The length of the GAP ofthe last sTTI is the same as the length of the GAP of the lTTI. Thelength of the AGC of each sTTI is the same as that of the lTTI. Or, thelength of the AGC of the first sTTI is the same as that of the lTTI, thelengths of AGCs of other sTTIs are all shorter than that of the lTTI.For example, the AGC of the first sTTI may include multiple OFDMsymbols, and AGCs of other sTTIs only include one OFDM symbolrespectively. Since the GAP is not set at the ends of other sTTIs, thereceiving-transmitting operations on the next sTTI will be influenced.Suppose the UE transmits signals in one sTTI, the UE may implement thetransmitting-to-receiving switching by using the former part of the AGCsymbol of the next sTTI, which means that the UE implements AGCoperations only by using the remaining part of the AGC symbol. Or, theUE may not perform the receiving operation in the next sTTI. Suppose theUE receives signals in one sTTI, the UE may implement thereceiving-to-transmitting switching by using the former part of the AGCsymbol of the next sTTI, which means that the UE can transmit effectivesignals or data for AGC only by using the remaining part of the AGCsymbol. Or, the UE may not perform the transmitting operation in thenext sTTI.

As shown in FIG. 8(d), an AGC may be set at the beginning of the firstsTTI, and the length of the AGC of the first sTTI is the same as that ofthe lTTI. A GAP is set at the end of the last sTTI, and the length ofthe GAP of the last sTTI is the same as that of the lTTI. A shorter GAPand a shorter AGC are inserted between adjacent two sTTIs, that is, thelength of the inserted GAP and AGC is shorter than the length of the GAPand AGC of the lTTI respectively. For example, one OFDM symbol is usedto generate the GAP and the AGC. Since the GAP and the AGC areintroduced, the receiving-transmitting operations of the UE in one sTTIdo not influence the receiving-transmitting operations of the UE in thenext sTTI. Since the AGC and the GAP are shorter, the overhead of theAGC and the GAP may be decreased.

As shown in FIG. 8(e), suppose a subcarrier spacing (SCS) adopted by thesTTI is larger than that of the lTTI, the length of OFDM symbols of thesTTI is shorter than that of the lTTI. An AGC may be set at thebeginning of the first sTTI, and the length of the AGC is the same asthat of lTTI, for example, the AGC occupies OFDM symbols of multiplesTTIs. A GAP is set at the end of the last sTTI, and the length of theGAP is the same as that of lTTI, for example, the GAP occupies OFDMsymbols of multiple sTTIs. A shorter GAP and a shorter AGC are insertedbetween adjacent two sTTIs, that is, the length of the inserted GAP andAGC is shorter than the length of the GAP and AGC of the lTTI, forexample, the inserted GAP and AGC occupy one OFDM symbol of one sTTIrespectively. Since the GAP and the AGC are introduced, thereceiving-transmitting operations of the UE in one sTTI do not influencethe receiving-transmitting operations of the UE in the next sTTI. Sincethe AGC and the GAP are shorter, the overhead of the AGC and the GAP maybe decreased.

In the methods shown in FIGS. 4(b)˜4(e), in the OFDM symbols for AGC,all subcarriers may be occupied to transmit data, for example, transmitdata in the AGC with the SCS of 15 kHz, or transmit data in onesubcarrier every N subcarriers, for example, N is equal to 2. If thelatter method is adopted, signals on the OFDM symbols for AGC have arepeated structure in time. As shown in FIG. 13, suppose N is equal to2, the AGC symbol may be divided equally into two parts, and based onthe latter part of the AGC symbol, all data may be received. Thereceiving end may perform AGC operations by using the former part of theAGC symbol, and receive data on the latter part of the AGC symbol,thereby decreasing the overhead of the AGC. Depending on theimplementation of the receiving end, the latter part of the AGC symbolmay be used to receive data, or the AGC symbol may not be used toreceive data.

As shown in FIG. 8(f), suppose on the AGC symbol, data is transmitted onone subcarrier every N subcarriers, so as to have the repeated structureshown in FIG. 13, and suppose the OFDM symbol containing the GAP alsotransmits data on one subcarrier every N subcarriers, for example, N isequal to 2. As shown in FIG. 14, suppose N is equal to 2, the OFDMsymbol may be divided equally into two parts, and all data can bereceived based on the former part of the OFDM symbol. The former part ofthe OFDM symbol may still transmit data, but stop transmitting data onthe latter part of the OFDM symbol to generate the GAP, therebydecreasing the overhead of the GAP. The last symbol of the lTTI maygenerate the GAP according to the method shown in FIG. 14, or does nottransmit any signal, so that the whole symbol may be used for the GAP.Depending on the implementation of the receiving end, the latter part ofthe AGC symbol may be used to receive data, or the AGC symbol may not beused to receive data. Depending on the implementation of the receivingend, the former part of the OFDM symbol containing the GAP may be usedto receive data, or the OFDM symbol containing the GAP may not be usedto receive data.

For the structure of a sTTI shown in FIG. 8(f), suppose the first andthe last OFDM symbols of the sTTI both transmit data on one subcarrierevery N subcarriers. As shown in FIG. 15, suppose N is equal to 2, thetotal amount of data transmitted on the first OFDM symbol and the lastOFDM symbol is equivalent to the total amount of data transmitted onOFDM symbols with the SCS of 15 kHz. In FIG. 15(a), suppose a subcarrierfor data transmission on the first OFDM symbol of the sTTI is the sameas a subcarrier for data transmission on the last OFDM symbol of thesTTI. In FIG. 15(b), suppose the subcarrier for data transmission on thefirst OFDM symbol of the sTTI is different from the subcarrier for datatransmission on the last OFDM symbol of the sTTI. For a mappingstructure shown in FIG. 15, rate matching may be processed according toa case that a data channel includes time-frequency resources of integralOFDM symbols. For example, in FIG. 15, suppose two OFDM symbols are usedto bear DMRSes, the number of OFDM symbols for actual data transmissionis 4. That is, the rate matching may be processed according to 4 OFDMsymbols, but actually the modulation symbols of data are mapped to 5OFDM symbols for data transmission.

A second embodiment is described as follows.

When data transmission based on both lTTI and sTTI is supported in oneresource pool, the resource pool may be configured or pre-configuredaccording to the lTTI. In the LTE version 14, after excluding somesubframes unavailable for V2X, for example, subframes of sidelinksynchronization channel (SLSS), time division duplexing (TDD) downlinksubframes and reserved resources. All remained subframes are logicallyordered, and then the resource pool is defined through periodicallyapplying bitmap based on the indexes of the ordered logic subframes. The‘1’ in the bitmap represents that the subframe belongs to the resourcepool, and the ‘0’ represents that the subframe does not belong to theresource pool.

For the data transmission based on the lTTI, the resource pool may beconfigured based on the indexes of physical subframes, or may be definedbased on the indexes of logic subframes according to the methoddescribed in the LTE version 14. For the data transmission based on thesTTI, the resource pool is still defined according to the lTTI, so thatadditional signaling or configuration information is not needed. Supposeone lTTI is divided into M sTTIs, the index of the mth sTTI in the lTTIwith the index k is k·M+m, wherein k=0,1, . . . , K−1, m=0,1, . . . ,M−1 and K is a maximum value among the indexes of the lTTI. According tothis method, for a service, suppose the reservation interval isPrsvp=k·Pstep when adopting the data transmission based on the lTTI,wherein Pstep is a basic reservation interval, for example, 100, k is acoefficient, and the range of k may be configured by a higher layer. Inthe LTE version 14, a maximum set of the range of k is[⅕,½,1,2,3,4,5,6,7,8,9,10], and the reservation interval is P_(rsvp)^((s))=k·M·P_(step) when adopting the data transmission based on thesTTI. Or, the sTTI is represented with a two-dimensional index (k, m),wherein k is the index of the lTTI to which the sTTI belongs, and m isthe index of the sTTI in the lTTI. According to the method, thereservation interval of the sTTI is equal to the reservation interval ofthe lTTI, that is, Prsvp=k·Pstep, but the influence of thetwo-dimensional index (k, m) needs to be considered when performingresource selection and indicating resources in the SA.

Or, for a resource pool, some time units (TUs) unavailable for V2X maybe excluded. The TUs may be subframes, time slots or mini-slots, and onetime slot may be divided into multiple mini-slots. The lTTIs of allremained TUs are ordered by the UE adopting the lTTI, and then a firstresource pool is defined based on the indexes of the ordered logicsubframes. The sTTIs of all remained TUs are ordered by the UE adoptingthe sTTI, and then a second resource pool is defined based on theindexes of the ordered logic subframes. In view of the time resource,the first resource pool and the second resource pool may overlapentirely, or overlap partially.

A third embodiment is described as follows.

In the case that the data transmission amount is unchanged, if the TTIis shortened, frequency resources needed by the UE are increased, so asto ensure the transmission performance. For example, suppose 2 PRBs areoccupied when the SA is transmitted in the lTTI and one lTTI is dividedinto 2 sTTIs, about 4 PRBs needs to be occupied when the SA istransmitted in one sTTI. As shown in FIG. 8(b), 8 OFDM symbols in thelTTI are used to bear data. Because of the overhead of additional AGCand GAP, the number of OFDM symbols for bearing DMRSes and data in thesTTI is 5. Suppose two OFDM symbols are used to bear the DMRSes, only 3OFDM symbols are used to bear data. In this case, when ensuring thecoding rate of the SA is unchanged, the number of needed PRBs is 16/3.Through decreasing the number of bits of the SA of the sTTI, the numberof needed PRBs may be decreased.

For a resource pool, according to the lTTI, a data channel is dividedinto N sub-channels, and resources are assigned based on thesub-channels. Correspondingly, a SA resource pool is also divided into NSA resources, so as to correspond to N sub-channels. Because the lengthof the TTI changes, the number of data sub-channels of sTTI may be thesame as or larger than the number of data sub-channels of lTTI.

Suppose the number of PRBs of data sub-channels of the sTTI is the sameas that of the lTTI, and suppose frequency resources occupied by the SAof one sTTI is m times frequency resources occupied by the lTTI. Asshown in FIG. 9, the SA resources q+[0,1, . . . m−1] of the lTTI areoccupied by the qth SA of the sTTI, wherein q=0,1, . . . M−1, M=N−m+1.The data sub-channels linked to the qth SA of the sTTI may begin from adata sub-channel q and be assigned with the granularity of n continuoussub-channels. For example, n may be equal to 1 or m, and may beconfigured by a higher layer signaling or pre-configured. If n is largerthan 1, it is advantageous to decrease the overhead of indicatingsub-channel resources in the SA.

Or, suppose frequency resources occupied by the SA of one sTTI is mtimes frequency resources occupied by the lTTI, and the number of PRBsof data sub-channels of one sTTI is also m times that of the lTTI. Asshown in FIG. 10, the SA resources q·m+[0,1, . . . m−1]+Δ1 of the lTTIare occupied by the qth SA of the sTTI, wherein q=0,1, . . . , M−1 andM=└N/m┘, and the data sub-channel q·m+[0,1, . . . m−1]+Δ2 of the lTTI isoccupied by the qth data sub-channel of the sTTI. When m is notdivisible by N, the Δ1 and the Δ2 may adjust the location of SAresources occupied by the SA of the sTTI in the SA resource pool and thelocation of sub-channels occupied by the data sub-channels of the sTTIin the data resource pool. The Δ1 may be equal to or unequal to the Δ2.For example, the Δ1 and the Δ2 are both equal to 0. For the sTTI, the SAresources correspond to the data sub-channels one by one. The qth SA ofthe sTTI may schedule one or more continuous data sub-channels of thesTTI beginning from the data sub-channel q of the sTTI. This method maydecrease the overhead of indicating sub-channel resources in the SA.

A fourth embodiment is described as follows.

When data transmission based on both lTTI and sTTI is supported in oneresource pool, the influence of the data transmission based on both lTTIand sTTI should be considered during the resource selection of UE.

The UE senses the SA of another UE, and measures the PSSCH-RSRP of datachannel scheduled by the received SA, so as to perform resourceselection according to the above PSSCH-RSRP. The UE needs to sense theSA of the lTTI and the SA of the sTTI. When the measured PSSCH-RSRPexceeds a threshold, the corresponding data channel is unavailable. ForTTIs with different lengths, the thresholds of PSSCH-RSRPs may bedifferent. For TTIs with different lengths, the thresholds ofPSSCH-RSRPs may be configured or pre-configured respectively. Or, whenthe length of the TTI adopted by the sensed UE is the same as ordifferent from the length of the TTI adopted by the UE performingsensing, the thresholds of PSSCH-RSRPs may be configured orpre-configured respectively. Or, the threshold of PSSCH-RSRP is recordedas Th, and when a UE senses the SA scheduling a TTI with the samelength, the PSSCH-RSRP is compared with Th to determine whetherresources are available. When a UE senses the SA scheduling TTIs withdifferent lengths, the PSSCH-RSRP is compared with Th+Δ to determinewhether resources are available, wherein A is a power adjustmentparameter, which is a constant or is related to the priorities of thesensed UE and/or the UE performing sensing. For example, the thresholdof the PSSCH-RSRP corresponding to the SA scheduling TTIs with differentlengths may be smaller than the threshold of the PSSCH-RSRPcorresponding to the SA scheduling TTI with the same length, so as tofirst exclude the resources occupied by other UEs adopting TTIs withdifferent lengths, and avoid the conflict between UEs adopting TTIs withdifferent lengths. Or, the threshold of the PSSCH-RSRP is recorded asTh, and when a UE senses the SA scheduling a TTI with the same length,it is determined whether resources are available through comparing thePSSCH-RSRP with the threshold Th. When a UE senses the SA schedulingTTIs with different lengths, the PSSCH-RSRP measured according to the SAmay be modified, that is, it is determined whether the resources areavailable through comparing the PSSCH_RSRP+Δ with the threshold Th,wherein A is a power adjust parameter, which is a constant or is relatedto the priorities of the sensed UE and/or the UE performing sensing. Forexample, A may be a negative value, so as to first exclude the resourcesoccupied by other UEs adopting the TTI with the same length, and allowthe conflict between UEs adopting TTIs with different lengths. In a casethat equal amounts of data are transmitted, if the sTTI is adopted, morefrequency resources will be occupied, and if the lTTI is adopted, moretime resources will be occupied. UEs adopting two transmission methodswill not conflict absolutely, so the partial overlap of resourcesoccupied by UEs adopting TTIs with different lengths influences the datareception to a lesser degree. The method for excluding resourcesaccording to the PSSCH-RSRP may be only used when the UE performingsensing adopts the lTTI, or may be only used when the UE performingsensing adopts the sTTI, or may be used by the UE performing sensingwithout differentiate the length of the TTI adopted by the UE performingsensing.

The UE may also measure S-RSSI of resources, and select severalresources with minimum S-RSSIs to obtain a set SB. The length of the TTIof the above resources is the same as the length of the TTI adopted bythe UE. In order to obtain the S-RSSI of one lTTI resource, suppose theS-RSSI is measured according to the lTTI. For a lTTI, the UE may obtainthe S-RSSI through measuring other symbols except the AGC and GAPsymbols of the lTTI. Or, for a lTTI, because the lTTI is divided intomultiple sTTIs and each sTTI may have its own GAP symbol, the UE maymeasure the S-RSSI on all symbols not used for GAP, wherein symbols notused for GAPs does not include the AGC and GAP symbols of the lTTI. Forexample, except the AGC and GAP symbols of the lTTI, in the method shownin FIG. 8(b), the GAP symbol of the first sTTI is not used to measurethe S-RSSI; in the method shown in FIG. 8(d), the GAP in the former partof the second sTTI is not used to measure the S-RSSI; in the methodshown in FIG. 8(e), the GAP symbol of the first sTTI is not used tomeasure the S-RSSI. The UE may also measure the S-RSSI only on a subsetof time resources determined according to the above rule. In thismethod, since the GAP symbol of the sTTI is not used to measure theS-RSSI, the strength of interference signals can be estimatedaccurately, so as to decrease conflict. In order to obtain the S-RSSI ofone sTTI resource, suppose the S-RSSI is measured according to the sTTI.For a sTTI, the UE may obtain the S-RSSI through measuring other symbolsexcept the AGC and GAP symbols of the sTTI. For a lTTI resource, supposethe lTTI resource is divided into N sTTI resources sn in time, n=0,1 . .. N−1, and the frequency resources of sn are the same as the lTTIresource. In order to obtain the S-RSSI of the lTTI resource, the UE mayfirst measure the S-RSSI of each sTTI resource sn, and then obtain theS-RSSI of the lTTI resource according to the S-RSSI of each sTTIresource sn. For example, the S-RSSI of the lTTI resource may be amaximum value, an average value or a weight average value of the S-RSSIsof sTTI resources sn. The above method for measuring the S-RSSI may beonly used when the UE performing sensing adopts the lTTI, or may be onlyused when the UE performing sensing adopts the sTTI, or may be used bythe UE performing sensing without differentiate the length of the TTIadopted by the UE performing sensing.

Afterwards, the UE selects resources in the set SB. The UE may randomlyselect resources in the set SB. Or, suppose the UE adopts the sTTI, fora sTTI resource in the SB, if other sTTI resources with the samefrequency location or overlapping with the sTTI resource are unavailablein the lTTI to which the sTTI resource belongs, the UE selects the sTTIresource with a large probability. By using the method, the UE adoptingthe sTTI can use the same or adjacent PRBs in one lTTI as possible, soas to reserve more lTTI resources for the UE adopting the lTTI, andfurther avoid the conflict between UEs adopting TTIs with differentlengths. As shown in FIG. 11, suppose resources 1102 and 1111 areunavailable, and other four resources 1101, 1112, 1103 and 1113 are allavailable. Because the resources 1103 and 1113 belong to the same PRB,the probability that the resources 1103 and 1113 are selected by the UEadopting the sTTI is smaller than the probability that the resources1101 and 1112 are selected by the UE adopting the sTTI, so as tofacilitate the lTTI resource composed by the resources 1103 and 1113 tobe selected by other UEs adopting lTTIs.

For a resource pool, one lTTI is divided into N SA resources of thelTTI, and one sTTI is divided into M SA resources of the sTTI. During aperiod of time corresponding to one lTTI, the number of SAs to be sensedby the UE is L=N+m·M, wherein m is the number of sTTIs obtained throughdividing the lTTI. The number of SAs that can be sensed by the UE duringa period of time corresponding to one lTTI depends on the capability ofthe UE. For a UE with a higher capability, the number of SAs that can besensed by the UE is larger than or equal to L, and the UE may sense eachpossible SA resource. Suppose the capability of the UE is limited, thatis, the number of SAs that can be sensed by the UE is smaller than L, arule may be defined in which the UE may select to-be-sensed SAs. In onepossible rule, different sensing priorities may be defined for TTIs withdifferent lengths. For example, the UE first ensures that SA resourcesof all lTTIs can be sensed, and then the remained capability of the UEis used to sense SA resources of sTTIs. For example, suppose V2Xmessages related to security are transmitted in a lTTI, the SA resourcesof the lTTI need to be sensed firstly. Or, in another rule, the numberLL of SA resources of the lTTI to be sensed by the UE and the number LSof SA resources of the sTTI to be sensed by the UE are determinedrespectively. The parameters LL and LS may be configured by a basestation or pre-configured, or may be predefined in a standard accordingto a UE capability. Or, suppose the maximum number of SA resources thatcan be sensed by the UE in one lTTI is Lmax, in another rule, the numberLL of SA resources of the lTTI to be sensed by the UE is determined, andthe remained SA sensing capability, i.e., Lmax-LL, is used to processthe SA resources of the sTTI. The parameter LL may be configured by abase station or pre-configured, or may be predefined in a standardaccording to a UE capability.

In addition, the number of PRBs that can be decoded by the UE alsodepends on the capability of the UE. The number of PRBs refers to thenumber of PRBs of data channels, or the number of PRBs including SAs anddata channels. The capability of the UE about how many PRBs can besensed may be defined only according to the TTI with one length, forexample, the lTTI, and may be converted into the capability of the UEdefined according to the TTI with another length. Or, the capability ofUE about how many PRBs can be sensed may be defined according the TTI ofeach length. If the capability of the UE about how many PRBs can besensed is defined according the TTI with one length, the capability ofthe UE may be only used to sense the PRB of the TTI with this length.Or, if the capability of the UE about how many PRBs can be sensed isdefined according the TTI with one length, the capability of the UE maybe converted into the capability of the UE used for sensing the PRBs ofTTIs with other lengths. For example, if the number of PRBs that can besensed by the UE in one lTTI is N, the number of PRBs that can be sensedby the UE in one sTTI may be defined as c·N, wherein c is a coefficientrelated to the relative length of the sTTI and the lTTI, for example, cis equal to 2. Suppose the capability of the UE is limited, a rule maybe defined in which the number of the PRBs to be sensed according toTTIs with different lengths is determined by the UE. In one possiblerule, different sensing priorities may be defined for TTIs withdifferent lengths. For example, the UE first ensures that PRBs of alllTTIs can be sensed, and then the remained capability of the UE is usedto sense PRBs of sTTIs. For example, suppose V2X messages relatedsecurity are transmitted in a lTTI, the PRBs of the lTTI need to besensed firstly. Or, in another rule, the number LL of PRBs of the lTTIto be sensed by the UE and the number LS of PRBs of the sTTI to besensed by the UE are determined respectively. The parameters LL and LSmay be configured by a base station or preconfigured, or may bepredefined in a standstand according to a UE capability. Or, suppose themaximum number of PRBs that can be sensed by the UE in one lTTI is Lmax,in another rule, the number LL of PRBs of the lTTI to be sensed by theUE is determined, and the remained sensing capability of the UE is usedto process the PRBs of sTTIs, that is, the sensing capabilitycorresponding to the PRBs of Lmax-LL lTTIs are used to process the PRBsof sTTIs. The parameter LL may be configured by a base station orpreconfigured, or may be predefined in a standstand according to a UEcapability.

According to the above method, the disclosure also provides anapparatus. The apparatus may implement the above method. As shown inFIG. 12, the apparatus includes a sensing module, a resource selectingmodule and a receiving-transmitting module.

The sensing module is applied to a UE to sense SA of another UE in asensing window based on TTIs with different lengths in a resource pool,measure a receiving power of a scheduled data channel based on the SA,and sense a receiving energy of each sub-channel of each subframe.

The resource selecting module is applied to the UE to select resourcesfor data transmission according to the SA, the receiving power and thereceiving energy.

The receiving-transmitting module is applied to the UE to transmit theSA to indicate the selected resources, and perform data transmission onthe resources.

Those skilled in the art can understand that all or part of processes inthe method provided by the embodiments of the disclosure can beimplemented by instructing related hardware by a program. The programmay be stored in a computer-readable memory, and one or combination ofprocesses of the above method is included when the program is operated.

In the embodiments of the disclosure, the modules may be integrated intoa processing module, or may be separated physically. Or, two or moremodules are integrated into a module. The above integrated module may beimplemented by hardware or software. If the integrated module isimplemented by software and is sold or used as an exclusive product, theintegrated module may be stored in a computer-readable storage medium.

The storage medium may be a read-only memory (ROM), a disk or a compactdisc (CD).

The foregoing is only preferred embodiments of the disclosure and is notused to limit the protection scope of the disclosure. Any modification,equivalent substitution and improvement without departing from thespirit and principle of the disclosure are within the protection scopeof the disclosure.

To make the objectives, technical solutions, and advantages of thepresent invention more comprehensible, the present invention is furtherdescribed in detail below with reference to the accompanying drawingsand embodiments.

FIG. 17 is a flowchart according to the present invention.

Step 1701: The UE detects a physical downlink control channel (PDCCH) ona configured control resource set (CORESET).

The time resources can be divided according to a certain time unit (TU),and the TU can refer to a subframe, a slot or a mini-slot. A slot can bedivided into a multiple of mini-slots, and a mini-slot includes one ormore OFDM symbols (OSs). Within a downlink TU, the base station canconfigure the UE with one or more CORESETs. One PDCCH is mapped into oneCORESET.

Step 1702: The UE parses the detected PDCCH and receives the PDSCHaccordingly, and determines PUCCH resources for feedback of HARQ-ACKinformation.

For HARQ-based downlink data transmission, after receiving the datatransmitted by the base station, the UE needs to feed back HARQ-ACKinformation accordingly, and correspondingly needs to determine thePUCCH resources for feedback of HARQ-ACK information.

Step 1703: The UE transmits HARQ-ACK information on the determined PUCCHresources, and transmits a scheduled physical uplink shared channel(PUSCH).

Here, the physical resource blocks (PRBs) used for data channelfrequency hopping can avoid as much as possible resource conflicts withthe resource for PUCCH transmission, when the uplink data channelsupports the frequency hopping operation.

The method for processing the uplink and downlink control channelaccording to the present invention is described below with reference tothe embodiments.

A fifth embodiment is described as follows.

The UE can transmit a multiple of types of uplink control information(UCI) in an uplink direction, such as, a periodic channel stateindication CSI (P-CSI), a scheduling request (SR) and HARQ-ACKinformation. PUCCH formats used to bear different types of UCI aregenerally different. The above-described PUCCH resources can be definedon part of or all of the uplink OSs in a TU; or, the above-describedPUCCH resources can also be defined in a multiple of TUs to increase thecoverage. Depending on an uplink and downlink structure of the TU, thenumber of OSs for bearing PUCCH resources in one TU can be variable. Forexample, assuming that a TU includes seven OSs and the TU can becompletely used for uplink transmission, so that the number of OSs forPUCCH resources is 7. A TU can include one downlink area fortransmitting PDCCH, and the remaining part is used for uplinktransmission. Assuming that two OSs are used to bear the PDCCH, then thenumber of OSs for the PUCCH resource is 5. For a case of unittime-frequency resource being multiplexed by code division multiplexing(CDM), for example, for a case of a multiple of PUCCH channels beingmultiplexed on a PRB of a TU, the number of PUCCH channels which can bemultiplexed on the above-described unit time-frequency resource can alsobe variable, when the number of OSs for PUCCH resources in the TUchanges.

For a PUCCH format, assuming that PUCCH resources are defined in allPRBs which can be used for PUCCH transmission, and it is determined bybase station that the base station actually allocates which PUCCHresources in which PRB. The number of PUCCH resources multiplexed in aunit time-frequency resources is denoted as A, and PRBs which can beused for PUCCH transmission can be divided into B unit time-frequencyresources described in the above. The total number of PUCCH resourcessupporting the PUCCH transmission is A×B, and the index range of whichis n_(PUCCH) ^((x))=0,1, . . . , A×B−1. For example, in the LTE system,for PUCCH format 3, five channels can be multiplexed in one PRB, whichcorresponds to a maximum bandwidth of 110 PRBs. The index of resourcesfor PUCCH format 3 can be ranged from 0 to 549. Based on the aboveanalysis, when the number of OSs for PUCCH transmission in a TU changes,the number of PUCCHs which can be multiplexed in the above unittime-frequency resource can also be variable, for example, changes fromA to a. At this time, the total number of PUCCH resources supporting thePUCCH transmission accordingly changes to a×B, the index range of whichis n_(PUCCH) ^((x))=0,1, . . . , a×B−1. Corresponding to differentvalues of the number of OSs used for PUCCH transmission, the number ofPUCCH resources multiplexed in one unit time-frequency resource can bepredefined, can be calculated according to the number of OSs used forPUCCH transmission, or can be configured by a higher-layer signaling.For a UE, the index of the PUCCH resource allocated by the UE is denotedas n, and the above-described allocated index n is not changed with thenumber of OSs used for PUCCH transmission. In this way, PUCCH resourcesallocated to this UE always exist as long as the condition n≤min(A×B−1,a×B−1) is satisfied. The allocated PUCCH resources still do not conflictwhen the number of OSs for PUCCH transmission changes, as long as thescheduling of the base station ensures that the indexes n of the PUCCHresources allocated by UEs do not conflict.

For a PUCCH format, the number of PUCCHs which can be multiplexed in theabove-described unit time-frequency resource can also be variable, whenthe number of OSs for PUCCH resources in a TU changes. For differentPUCCH formats, the number of multiplexed PUCCHs may change in differentproportions. As shown in FIG. 18 (a), it is assumed that b PRBs areallocated for the PUCCH format 1 channel starting from the PRB index 0,then several PRBs are allocated for the PUCCH format 2 channels startingfrom the PRB index b. The PUCCH areas are contiguous and the remainingresources are used for data transmission, since the resources of the twoPUCCH formats are allocated contiguous PRBs. As shown in FIG. 18 (b),when the number of OSs for the PUCCH resources in a TU changes, it isassumed that the number of the PUCCH resources multiplexed in the twoPUCCH formats change in the same proportion, for example, both reducedby half, then the both newly added coefficients of the number of the PRBoccupied are 2, in order to bear the same number of PUCCH resources.That is, 2 b PRBs need to be allocated for PUCCH format 1, and PRBs areused for PUCCH format 2 starting from PRB index 2b. The PUCCH areas arecontiguous and the remaining resources are used for data transmission,since the resources of both PUCCH formats are still allocated continuousPRBs. As shown in FIG. 18(c), when the number of OSs for PUCCH resourcesin a TU changes, it is assumed that the number of PUCCH resourcesmultiplexed in one PRB in two PUCCH formats changes in differentproportions, for example, ⅔ and ⅓, wherein the coefficient of the numberof the PRBs occupied by PUCCH Format 1 is 1.5, and the coefficient ofthe number of the PRB occupied by PUCCH format 2 is 3, in order to bearthe same number of PUCCH resources. The number of PRBs occupied by PUCCHformat 1 is about 1.5b, while the PRBs used for PUCCH format 2 is startfrom the PRB index 3b, then there is approximately an interval of 1.5bPRBs between the two PUCCH formats. The PRBs in this interval are notcontiguous with other PRBs used for data channels, thereby affecting theflexibility of resource allocation.

According to the analysis of FIG. 18, when the number of OSs for PUCCHresources in a TU changes, it is assumed that the number of PUCCHresources multiplexed in one PRB in two PUCCH formats change indifferent proportions, data channel fragmentation is possible caused, ifthe time-frequency resources to which the PUCCH resources are mapped isdetermined according to each PUCCH format independently.

In order to avoid the above situation, when the number of OSs for thePUCCH resources in one TU changes and it is necessary to adjust thetime-frequency resource to which the PUCCH resource is mapped, astarting point of the channel to which the second type of PUCCH formatis mapped is determined according to an ending point of the channel towhich the first type of PUCCH format is mapped. For example, when thelast PUCCH resource of the first type of PUCCH format is mapped to PRBx, the PUCCH resource of the second type of PUCCH format should bemapped from PRB x or PRB x+1 to avoid the fragmentation. According tothe above-described starting point, the PUCCH resource whose index is 0in the second type of PUCCH format can be determined.

Or, a parameter N_(RB) ^((2,ref)) can be configured by using ahigher-layer signaling. When the number of OS for PUCCH resources in aTU changes, the parameters N_(RB) ⁽²⁾ are obtained according to theabove-described the number of OSs (e.g., L) for the PUCCH and aparameter N_(RB) ^((2,ref)). The parameter N_(RB) ⁽²⁾ can indicate anending PRB to which the first type of PUCCH format is mapped, and astarting PRB to which the second type of PUCCH format is mapped can bethe next PRB of the above-described ending PRB; or, the parameter N_(RB)⁽²⁾ can also indicate the starting PRB to which the second type of PUCCHformat is mapped. The above-described starting PRB includes a PUCCHresource whose index in the second type of PUCCH format is 0. Forexample, according to the number of OSs (e.g., L) for PUCCH of a TU anda reference value L0 of the number of OSs for the PUCCH resource, theproportion of the change in the number of PUCCH resources multiplexed inone PRB in the first type of PUCCH format p=f(L,L0) can be obtained, forexample, p=f(L,L0), or, the proportion p is calculated according to thenumber of PUCCH resources multiplexed on one unit time-frequencyresource corresponding to the number of OSs for the PUCCH. Further, aparameter N_(RB) ⁽²⁾=g(N_(RB) ^((2,ref)),p) is obtained according to theproportion p and the parameter N_(RB) ^((2,ref)), for) example, N_(RB)⁽²⁾=└N_(RB) ^((2,ref)),p┘ or N_(RB) ⁽²⁾=|N_(RB) ^((2,ref))·p|.

Or, for a PUCCH format, an offset N_(PUCCH) ^(offset) of an index of aPUCCH resource can be configured. The N_(PUCCH) ^(offset) depends on thenumber of OSs for bearing one PUCCH resource. For a type of PUCCHformat, each different number of OSs for bearing PUCCH resource can berespectively configured with an N_(PUCCH) ^(offset); or, the number ofOSs for PUCCH resources can be divided into sets. For example, each setincludes some similar number of OSs, and each set is respectivelyconfigured with an N_(PUCCH) ^(offset). Assuming that an index of PUCCHresource configured by a higher-layer signaling is n, the index of PUCCHresource of the actually configured UE in one TU is nk+N_(PUCCH)^(offset). Assuming that PUCCH resources are indicated by an ARI-basedmechanism, N PUCCH resources are configured by a higher-layer signalingand one of the N PUCCH resources is indicated by the ARI. Theabove-described N PUCCH resources are nk, wherein, k=0,1, . . . N−1,then the index of PUCCH resource of the actually configured UE in one TUis nk+N_(PUCCH) ^(offset). In this way, the index 0 of PUCCH resourcecan be fixedly mapped to a PRB, for example, PRB index 0.

A sixth embodiment is described as follows.

For HARQ-based downlink data transmission, after receiving the downlinkdata, the UE can feed back the HARQ-ACK information by the PUCCHresource. In addition, the UE also needs to report periodic CSI (P-CSI)information to the base station through the PUCCH resource. Theabove-described PUCCH resources can be defined on part of or all of theuplink OSs in a TU, or the above-described PUCCH resources can also bedefined in a multiple of TUs to increase the coverage. Depending on anuplink and downlink structure of the TU, the number of OSs which can beused for bearing PUCCH resources in one TU can be variable. For example,assuming that a TU includes seven OSs and the TU can be completely usedfor uplink transmission, so that the number of OSs for PUCCH resourcesis 7. A TU can include one downlink area for transmitting PDCCH, and theremaining part is used for uplink transmission. Assuming that two OSsare used for bearing the PDCCH, the number of OSs for the PUCCH resourceis five. In a case that a certain amount of UCI payload is borne, thenumber of PRBs occupied by the PUCCH resources can increasescorrespondingly so as to ensure the transmission performance of thePUCCH resources, when the number of OSs for PUCCH resources in a TUdecreases.

For each PUCCH resource, a PRB resource occupied by the PUCCH can beconfigured, for example, a starting PRB occupied by the PUCCH resourceand the number of PRBs continuously occupied can be configured. Inaddition, other parameters of the PUCCH resources can also beconfigured. Or, it is assumed that the number of PRBs occupied by onePUCCH resource is fixed, for example, one PRB, the total number of PRBsfor bearing PUCCH resources changes correspondingly according to thechange of the number of multiplexed PUCCH resources in one PRB, when thenumber of OSs for bearing PUCCH resources changes. It is assumed that amultiple of PUCCH formats exist, the number of bits of payload which canbe borne by the multiple of PUCCH formats are different. Theabove-described multiple of PUCCH formats can include a PUCCH mapped toa relatively small number of OSs, for example, one or two OSs, which arereferred to short PUCCHs; and a PUCCH mapped to a relatively largenumber of OSs, for example, equal to or greater than four OSs, which arereferred to long PUCCHs. Or, the above-described multiple of PUCCHformats can also refer only to different formats of long PUCCHs. Thenumber of OSs of the above-described multiple of PUCCH formats can bevariable. Or, one part of the OS data of the PUCCH format can bevariable, and the other part of OS data of the PUCCH format can befixed. For example, PUCCH format 3 in LTE bears less than or equal to 22bits while PUCCH format 4 can bear more bits, so that PUCCH format 3 orPUCCH format 4 is selected for UCI transmission according to the numberof bits of UCI.

For HARQ-based downlink data transmission, an ARI-based mechanism can beused to indicate PUCCH resources. That is, a set of candidate PUCCHresources is configured by a higher layer, and one PUCCH resources ofthe above-described set is dynamically indicated by an ARI in a PDCCH.The following describes a method for configuring PUCCH resourcesindicated by the ARI according to the present invention.

The first method for configuring PUCCH resources is to configure N PUCCHresources by a higher-layer signaling which is independently of thenumber of OSs for bearing the PUCCH resources and then adjust theabove-described configured N PUCCH resources according to the number ofOSs used for the PUCCH. The starting PRB index of the nth configuredPUCCH resource is denoted as Sn which occupies Rn PRBs, wherein, n=0,1,. . . N−1. The number of OSs currently used for the PUCCH resources isdenoted as L, then the above-described configured nth PUCCH resource canbe adjusted to continuously occupy R_(n)=f(R_(n),L,L₀) PRBs startingfrom the starting PRB index Sn, wherein, L0 is the number of OS forreference. For example, assuming that the PUCCH resources are mappedinto a TU and the TU includes 7 OSs, then L0 is equal to 7,R_(n)′=└R_(n)·L/L₀┘ or R_(n)′=┌R_(n)·L/L₀┐. When a multiple of PUCCHformats exists, PUCCH resources are respectively configured for eachPUCCH format. When the above-described configured N PUCCH resources arerespectively adjusted according to the number of OSs used for PUCCH, thenumber of bits of payload which can be borne by the N PUCCH resourceschanges accordingly, the PUCCH formats suitable for UCI transmission canalso change possibly. That is, the PUCCH format to be used can bedetermined according to the number of bits of UCI and the number of OSsused for PUCCH so as to further determine the available N PUCCHresources. The ARI indicates one of the above-described N PUCCHresources.

A second method for configuring PUCCH resources is to configure a set ofPUCCH resources by higher-layer signaling according to different numberof OSs for bearing PUCCH resources respectively, wherein, each set ofPUCCH resources includes N PUCCH resources. The above-described one setof PUCCH resources is respectively configured for each different numberof OSs for PUCCH resource, or, the number of OSs for PUCCH resources canbe divided into sets, for example, each set including some similarnumber of OSs, and one set of PUCCH resources is respectively configuredfor each set of the number of OSs. When a multiple of PUCCH formatsexist, PUCCH resources can be respectively configured for each PUCCHformat. The number of bits of payload which can be borne by the PUCCHformat of each PUCCH format can be determined according to the number ofOSs used for bearing the PUCCH, and the PUCCH format used for UCItransmission can also change possibly. That is, the PUCCH format needsto be used can be determined according to the number of bits of UCI andthe number of OSs used for PUCCH. A corresponding set of PUCCH resourcescan be obtained according to the number of OSs currently for bearing thePUCCH so as to indicate one of the above-described set of N PUCCHresources by using the ARI.

A third method for configuring PUCCH resources is to configure amultiple sets of PUCCH resources by a high-layer signaling, wherein, theabove-described each set of PUCCH resources includes N PUCCH resources.For example, each above-described set of PUCCH resources can correspondto a number of OSs or multiple of the number of OSs for bearing PUCCHresources. The ARI indicates one set of PUCCH resources to be used. Inthis method, the ARI actually bears the information on the number of OSsfor bearing the PUCCH resources. For example, assuming that a structureof a TU is indicated by a public DCI dynamically, the UE does notreceive the public DCI of the TU where the PUCCH resources are locatedwhile generating the UCI and needing to process the UCI, therefore, theUE possibly does not know the number of OSs which can be used for PUCCHtransmission of the TU. In this way, the UE can know the number of OSsfor bearing the PUCCH resources by the ARI so as to start to process theUCI.

The number of OSs for bearing the PUCCH resources obtained by the ARI ispossibly different from the information indicated by the public DCI ofthe TU where the PUCCH resource is located. Specifically, the ARI canonly indicate a range of the number of OSs for bearing PUCCH resources.The UE can process the UCI according to the number of OSs indicated bythe ARI. The actual number of OSs available for bearing PUCCH resourcescan be obtained according to the information indicated by the publicDCI. The UE can transmit the PUCCH according to the actual number of OSsavailable for bearing the PUCCH resources. Or, when the actual number ofOSs available for bearing PUCCH resources is greater than or equal tothe number of OSs indicated by the ARI, the UE can transmit the PUCCHonly according to the number of OSs indicated by the ARI; otherwise, theUE transmits the PUCCH according to the actual number of OSs availablefor bearing PUCCH resources.

When a multiple of PUCCH formats exist, PUCCH resources can berespectively configured for each PUCCH format. The number of OSs forbearing the PUCCH is determined according to the ARI, and further thenumber of bits of payload which can be borne by the PUCCH resources ofeach PUCCH format is determined. The PUCCH format suitable for UCItransmission can also change. That is, the PUCCH format to be used canbe determined according to the number of bits of UCI and the ARI. TheARI indicates one set of PUCCH resources, and further indicates onePUCCH resource in the above-described set of PUCCHs.

In a third method for configuring PUCCH resources, an ARI indicates bothone set of PUCCH resources and one resource of N resources in the set.Or, one set of PUCCH resources to be used in the DCI can also beindicated by a field which actually bears information about the numberof OSs for bearing the PUCCH resources; and another field is used toindicate one of N resources within one set of PUCCHs.

A fourth method for configuring PUCCH resources is to configure amultiple sets of PUCCH resources by a high-layer signaling, wherein,each set of PUCCH resources includes N PUCCH resources. Which set ofPUCCH resources is used can be determined according to the combinationof the number of OSs for bearing PUCCH resources and ARI indicationinformation. For a case of the number of OSs for bearing the PUCCHresources, the above-described case can be a number of OSs or multipleof number of OSs, one set of PUCCH resources can be further determinedby the ARI. When a multiple of PUCCH formats exist, PUCCH resources canbe configured for each PUCCH format. The number of bits of payload whichcan be borne by the PUCCH resources of each PUCCH format is determinedaccording to the number of OS used for bearing PUCCH and the ARI, andthe PUCCH format suitable for UCI transmission can also change. That is,the PUCCH format to be used can be determined according to the number ofbits of UCI, the number of OSs used for bearing the PUCCH and the ARI.One set of PUCCH resources can be indicated by the combination of thenumber of OSs for bearing the PUCCH and the ARI, and one PUCCH resourcein the above-described one set of PUCCHs is further indicated.

For P-CSI, a set of candidate PUCCH resources can be configured by ahigher-layer signaling. The above-described set can include one or morePUCCH resources, and the above-described PUCCH resources can belong toone or more types of PUCCH formats, so that a suitable PUCCH resource isselected according to the current number of bits of UCI in combinationwith other information.

The first method for configuring PUCCH resources is to configure a setof PUCCH resources by a high-layer signaling, which is independently ofthe number of OSs for bearing the PUCCH resources. The above-describedone set of PUCCH resources can include one or more PUCCH resources,which can belong to a same or different PUCCHs formats, and theabove-described configured one set of PUCCH resources is adjustedaccording to the number of OSs for the PUCCH. The starting PRB index ofthe nth configured PUCCH resource is denoted as Sn which occupies RnPRBs, wherein, n=0,1, . . . N−1; N is the number of PUCCH resources ofone above-described set of PUCCH resources; the current number of OSsused for PUCCH resources is denoted as L. Then the above-describedconfigured nth PUCCH resource can be adjusted to continuously occupyR_(n)′=f(R_(n),L,L₀) PRBs starting from the starting PRB index Sn,wherein, L0 is the number of OSs for reference. For example, assumingthat the PUCCH resources are mapped into a TU and the TU includes 7 OSs,then L0 is equal to 7, R_(n)′=└R_(n)·L/L₀┘ or ┌R_(n)·L/L₀┐. When theabove-described configured one set of PUCCH resources is adjustedaccording to the number of OSs for PUCCH, the number of bits of payloadwhich can be borne by the above-described one set of PUCCH resourceschanges accordingly. When the PUCCH resources of the above-described oneset of PUCCH resources belong to a same PUCCH format, one PUCCH resourceto be used is determined according to number of bits of UCI and thenumber of OSs for PUCCH. When the PUCCH resources of the above-describedone set of PUCCH resources belong to a multiple of PUCCH formats, thePUCCH format suitable for UCI transmission can also possibly change.That is, the PUCCH format to be used and one PUCCH resource to be usedare determined according to the number of bits of UCI and the number ofOSs used for PUCCH.

The second method for configuring PUCCH resources is to respectivelyconfigure a set of PUCCH resources by using a higher layer signalingaccording to different number of OSs for bearing PUCCH resourcesrespectively. The above-described one set of PUCCH resources can includeone or more PUCCH resources, which can belong to the same or differentPUCCH formats. A set of PUCCH resources can be respectively configuredfor each different number of OSs of PUCCH resources or the number of OSsfor PUCCH resources can also be divided into sets, for example, each setincluding some similar number of OSs, and a set of PUCCH resources arerespectively configured for each set of the number of OSs. A set ofPUCCH resources are determined according to the number of OSs forbearing the PUCCH. When the above-described one set of PUCCH resourcesbelong to a same PUCCH format, one PUCCH resource to be used isdetermined according to the number of bits of UCI and the number of OSsused for PUCCH. One set of PUCCH resources is determined according tothe number of OSs used for bearing the PUCCH. When the above-describedone set of PUCCH resources belong to a multiple of PUCCH formats, thePUCCH format suitable for UCI transmission can also change, that is, thePUCCH format to be used and one PUCCH resource can be determinedaccording to the number of bits of UCI and the number of OSs used forPUCCH.

A seventh embodiment is described as follows.

According to the slot of the fifth embodiment, the number of OSs forbearing PUCCH in a TU can be variable depending on an uplink anddownlink structure of a TU. In a case that a certain UCI payload isborne, to achieve a same PUCCH transmission performance, the number ofthe PRBs occupied by the PUCCH increases, when the number of OSs for thePUCCH in one TU decreases. That is, in one TU, the actual number of thePRBs used for bearing UCI can change according to the number of OSs usedfor PUCCH resources in this TU.

For uplink data transmission, the frequency diversity gain can beobtained by supporting frequency hopping. In general, the larger theinterval of PRBs occupied by the uplink channel, the larger thefrequency diversity gain. For example, when a part of resources ofuplink bandwidth is allocated for PUCCH, for example, when the PRBresources of two sides of the uplink bandwidth is used for bearingPUCCH, the frequency hopping operation of the uplink data channel needsto avoid occupying the PRBs allocated for PUCCH as much as possible.According to the above analysis, the number of the PRBs used for thePUCCH resources changes according to the number of OSs used for PUCCH inthe TU. In order to avoid the conflict with a frequency hoppingoperation of an uplink data channel, the number of the PRBs unavailablefor the frequency hopping operation of the uplink data channel changesaccording to the number of OSs used for PUCCH in the TU. As shown inFIG. 19, the number of PRBs used for PUCCH can change according to thechange of the number of OSs for bearing the PUCCH in one TU.Correspondingly, the number of PRBs unavailable for the frequencyhopping operation of the uplink data channel changes 1501˜1503. Thepresent invention does not limit whether the number of PRBs used forPUCCH resources is equal to the number of PRBs unavailable for thefrequency hopping operation of the uplink data channel.

In one TU, the number of PRBs unavailable for the frequency hoppingoperation of the uplink data channel is denoted as N_(RB) ^(HO).Wherein, N_(RB) ^(HO) can be a value configured by a higher-layersignaling, which is independently to the number of OSs of the TU and thenumber of PRBs used for PUCCH resources. Or, N′_(RB) ^(HO) can be avalue configured by a higher-layer signaling, and for one TU, N′_(RB)^(HO) is adjusted according to the number of OSs for bearing the PUCCHresources of the TU to obtain N_(RB) ^(HO). The number of OSs forbearing PUCCH resources of one TU is denoted as L. Wherein, N_(RB)^(HO)=f(N′_(RB) ^(HO),L,L₀), and L0 is the number of OSs for reference.For example, assuming that PUCCH resources are mapped into a TU and theTU includes 7 OSs, then L0 can be equal to 7, N_(RB) ^(HO)=└N′_(RB)^(HO)·L/L₀┘ or N_(RB) ^(HO)=|N′_(RB) ^(HO)·L/L₀|. Or, correspondingN_(RB) ^(HO) can be configured by a higher-layer signaling for differentvalues of the number of OSs for bearing PUCCH resources; or the numberof OSs for bearing PUCCH resources can be divided into sets, forexample, the number of OSs contained in each set are, and correspondingN_(RB) ^(HO) is configured for each set of the number of OSs.

An eighth embodiment is described as follows.

Both the base station and the UE can support the broadband transmissioncapability, for example, a bandwidth of a carrier can reach 100 MHz. Or,the bandwidth capabilities of the base station and the UE can bedifferent, for example, the base station supports a broadband of 100 MHzbandwidth to operate as one carrier, and the single carrier capabilityof the UE is only 20 MHz, but 100 MHz can be obtained by aggregatingfive carriers. In order to support the UE with relatively low bandwidthcapability, 3GPP introduces a concept of bandwidth part (BWP). Forexample, a carrier of 100 MHz bandwidth can be divided into five 20 MHzBWPs so that each BWP can bear UEs with relatively low bandwidthcapabilities. In general, by configuring BWP, one UE can be enabled tooperate on one or more subbands of the entire carrier. Theabove-described UE can be a UE with low bandwidth capability or a UEwith high bandwidth capability.

On a carrier, when multiple of BWPs are configured for a UE, the BWPscan be the scheduled BWP indicated in the PDCCH. In addition, when amultiple of carriers are configured for the UE, the carriers can be thescheduled carriers indicated in the PUCCH. In generally, assuming that amultiple of carriers are configured for a UE and one or more BWPs areconfigured for each carrier, the carriers can be scheduled carriersindicated in PDCCH, and the BMP can be scheduled BWP indicated in thePUCCH. In the DCI format, the information indicating the carrier and theinformation indicating BWP can be independent fields or can be a jointfield for indicating the carrier and BWP. The carrier and the BWPcorresponding to each codeword in the above-described joint field can beconfigured by a higher-layer signaling. In this way, the overhead forindicating the carrier and BWP can be reduced as much as possible.

The PDCCH transmitted in one TU can also schedule data transmissions inone or more TUs. In the DCI format, information indicating the TU andinformation indicating the BWP can be independent fields, or it can alsobe a joint field for indicating the TU and BWP. The TU and the BWPcorresponding to each codeword in the above-described joint field can beconfigured by a higher-layer signaling. In this way, the overhead forindicating the TU and BWP can be reduced as much as possible. Further,in the DCI format, the information indicating the carrier, theinformation indicating the TU and the information indicating the BWP canbe independent fields, or it can be a joint field for indicating thecarrier, TU and BWP. The carrier, TU and BWP corresponding to eachcodeword in the above-described joint field can be configured by ahigher-layer signaling. In this way, the overhead for indicating thecarrier, the TU and the BWP can be reduced as much as possible.

A ninth embodiment is described as follows.

The base station can configure one or more CORESETs for bearing thePDCCH. One above-described CORESET corresponds to one set oftime-frequency resources. For example, frequency resources are allocatedby using PRB as granularity, and time resources are allocated by usingTU as granularity. A TU can refer to a subframe, a slot or a mini slot.A PDCCH is mapped into a CORESET. A CORESET generally can bear amultiple of candidate PDCCHs with the same or different aggregationlevels. In order to reduce the number of blind detections, the UE canonly detect a part of candidate PDCCHs of one CORESET.

The UE generally detects two DCI formats during data transmission, thatis, a fallback DCI format, which is used to enhance the reliability ofDCI transmission; and a transmission mode-related DCI format, which isused to match the channel characteristics by using a certaintransmission mode to improve the downlink transmission performance. Fora UE, in order to reduce the blind detection overhead, a search spacefor the UE to detect the PDCCH can be defined. The configuration of theabove-described search space comprises the number of the candidatePDCCHs configured corresponding to each CORESET. Or, the configurationof the above-described search space comprises the number of candidatePDCCHs corresponding to each possible aggregation level. Or, theconfiguration of the above-described search space can further comprisethe number of candidate PDCCHs corresponding to each possibleaggregation level, which is configured for each different DCI format,respectively.

For a UE, a CORESET can be respectively configured by distinguishing DCIformats. That is, one or more CORESETs which bears the above-describedDCI formats can be configured for one DCI format or a part of the DCIformats. For a configured CORESET, the number of the blind detection ofeach aggregation level of the above-described DCI format on the CORESETis further configured. Or, the number of the blind detection of eachaggregation level of the above-described format on the CORESET ispredefined, for example, the number of the blind detection of eachaggregation level of one DCI format on the CORESET is predefinedaccording to the total number of the time-frequency resources of thisCORESET. The above-described multiple of CORESETs configured fordifferent DCI formats can be overlapped or partially overlapped, therebyreducing the overhead of the channel estimation and demodulation of theUE. Specifically, the COREST of one DCI format can be a subset of theCORESET of the other DCI format.

Or, for a UE, with respect to a configured CORESET, DCI format which canbe borne by this CORESET is further configured. One CORESET is only usedto bear one DCI format, a part of DCI formats or the all of DCI formatsof this UE. For the above-described borne DCI format, the number of theblind detection of each aggregation level is further configured. Or, thenumber of the blind detection of each aggregation level of one DCIformat on the CORESET is predefined, for example, the number of theblind detection of each aggregation level of one DCI format on theCORESET is predefined according to the total number of thetime-frequency resources of this CORESET. The above-described multipleof CORESETs configured for bearing different DCI formats can beoverlapped or partially overlapped, thereby reducing the overhead of thechannel estimation and demodulation of the UE. Specifically, one CORESTcan be a subset of another CORESET.

Using the above-described method, CORESET bearing a fallback DCI formatcan be sparser than the CORESET bearing the transmission mode-relatedDCI format, for example, one subset, thereby reducing the overhead ofblind detection under the premise that the fallback DCI format can stillbe transmitted. Or, the decreased blind detection capability fordetecting the fallback DCI format can be used to detect moretransmission mode-related DCI formats, thereby improving the flexibilityof which the base station allocates the PDCCH for bearing thetransmission mode-related DCI format. As shown in FIG. 20, assuming thattwo CORESETs are configured for the UE, the transmission mode-relatedDCI format can be borne by using CORESET 1, and the fallback DCI formatcan be borne by using CORESET 2. Or, CORESET 1 bears the fallback DCIformat and the transmission mode-related DCI format, however, CORESET 2only bears the transmission mode-related DCI format.

Depending on the configuration of the CORESET by the base station, theCORESET configuration of the UE configured by the base station and itsnumber can be variable in one timing position, for example, in one slot.Correspondingly, the number of the blind detection to be performed bythe UE is also variable. By using the above method of the presentinvention, the number of blind detections of the CORESET and/or DCIformats at one timing position can be configured by a higher-layersignaling or pre-defined regardless of the influence of theabove-described change of CORESET at different timing position. Or, fora timing position, the number of blind detections of each CORESET and/orDCI format of the above-described timing position can be adjusted sothat the total number of blind detections is equal to or close to theallowed maximum number of blind detections. Or, the number of blinddetections is adjusted so that the total number of blind detections isequal to or close to the allowed maximum number of blind detections,only when the total number of blind detections of each CORESET and/orDCI format in one timing position exceeds the allowed maximum number ofblind detections. The above-described adjustment of the number of blinddetections of each CORESET and/or DCI format can be processed on a UEspecific search space (USS) of UE only.

For USS, the maximum number of blind detections for all CORESETs of allcomponent carriers (CCs) can be determined. Correspondingly, theabove-described operation of adjusting the number of blind detections ofeach CORESET and/or DCI format can be a joint processing on all CORESETsof all CCs so that the total number of blind detections is equal to orclose to the maximum number of blind detections; or, the number of blinddetections is adjusted so that the total number of blind detections isequal to or close to the maximum number of blind detections, only whenthe total number of blind detections exceeds the maximum number of blinddetections. The above-described maximum number of blind detections canbe configured by a higher-layer signaling, predefined, or indicateddynamically by a public PDCCH, or can be calculated according to someother parameters. For example, for the USS, assuming that the referencenumber of blind detections for each CC is N, the maximum number of blinddetections for C CCs is N·C; or, assuming that the total number of BWPsconfigured on C CCs is B and assuming that the reference number of blinddetections for each BWP is M, the maximum number of blind detections isM·B. The above-described parameters N and/or M can be configured by ahigher-layer signaling or predefined.

Or, for the USS, the maximum number of blind detections can also bedetermined for each CC respectively. Correspondingly, theabove-described operations of adjusting the number of blind detectionsof each CORESET and/or DCI format can also be processed for each CCrespectively. For each CC, the total number of blind detections of thisCC is made to be equal to or close to the maximum number of blinddetections; or, the number of blind detections is adjusted so that thetotal number of blind detections is equal to or close to the maximumnumber of blind detections only when the total number of blinddetections of this CC exceeds the maximum number of blind detections.The above-described maximum number of blind detections can be configuredby a higher-layer signaling, predefined, or indicated dynamically by apublic PDCCH, or can be calculated according to some other parameters.For example, for the USS, assuming that the reference number of blinddetections for each CORESET is N, and C CORESETs are configured on thisCC, then the maximum number of blind detections for CC is N·C; or, it isassumed that B BWPs are configured on one CC and the reference number ofblind detections for each BWP is M, then the maximum number of blinddetections for this CC is M·B. The above parameters N and/or M can beconfigured or predefined by a higher-layer signaling or predefined.

Or, for the USS or for a set of CORESETs, the maximum number of blinddetections of this set of CORESETs is determined. Accordingly, theabove-described operation of adjusting the number of blind detections ofeach CORESET and/or DCI format can also with respect to a set ofCORESETs so that the total number of blind detections of this set ofCORESETs is equal to or close to the maximum number of blind detections;the number of blind detections is adjusted so that the total number ofblind detections is equal to or close to the maximum number of blinddetections, only when the total number of blind detections exceeds themaximum number of blind detections. The above-described maximum numberof blind detections can be configured by a higher layer signaling,predefined, indicated dynamically by a public PDCCH, or can becalculated according to some other parameters. For example, for the USS,assuming that the reference number of blind detections for each CORESETis N, and the above-described one set includes C CORESETs, the maximumnumber of blind detections of this set of CORESETs is N·C; or, assumingthat the above-described one set of CORESETs is used for scheduling BBWPs and assuming that the reference number of blind detections for eachBWP is M, then the maximum number of blind detections for this CC isM·B. The above-described parameters N and/or M can be configured by ahigher-layer signaling or predefined.

When the number of blind detections in one timing position is to beadjusted, the adjustment on the number of blind detections of one ormore CORESETs can be prioritized according to a specific priority. Theabove-described priority can be configured by a higher-layer signalingor predefined. Or, the adjustment on the number of blind detections ofone or more DCI formats can be prioritized according to a specificpriority, and the above-described priority can be configured by ahigher-layer signaling or predefined. Or, the adjustment on the numberof blind detections of one or more aggregation levels can be prioritizedaccording to a specific priority, and the above-described priority canbe configured by a higher-layer signaling or predefined.

The number of blind detection of one aggregation level of one DCI formatof one CORESET in a timing position is denoted as x and a coefficientfor adjusting the number of blind detection is denoted as c, the numberof blind detections after adjustment can be round (c·x). Theabove-described parameter c can be the number of blind detections onlyused for adjusting the USS.

The above parameter c can be used for all the CCs. The parameter c canbe configured by a higher-layering signaling, for example, the number ofactivated CCs can be configured correspond to c; or the number ofCORESETs in a timing position can be configured to correspond to c; or,the number of activated BWPs configured to correspond to c. Or, c can bedynamically indicated on a public PDCCH. Or, c can also be obtainedaccording to other parameters. For example, if the maximum number ofblind detections of the UE in a timing position is denoted as N and thetotal number of blind detections before adjustment at this timingposition is denoted as n, then c=n/N.

The above-described parameter c can be determined for each CCrespectively. The parameter c can be configured by a higher-layeringsignaling. For example, for each CC, the number of CORESETs in a timingposition can be configured to correspond to c. Or, the c can bedynamically indicated on a public PDCCH. Or, c can also be obtainedaccording to other parameters. For example, for a CC, the maximum numberof blind detections of the UE in a timing position is denoted as N, andthe total number of blind detections before adjustment in this timingposition is n, then c=n/N.

The above-described parameter c can be determined for each set ofCORESETs respectively. The parameter c can be configured by a higherlayer signaling. For example, for each set of CORESETs, the number ofCORESETs in a timing position can be configured to correspond to c. Or,the c can be dynamically indicated on a public PDCCH. Or, the c can alsobe obtained according to other parameters. For example, for one set ofCORESETs, the maximum number of blind detections of the UE in a timingposition is denoted as N, and the total number of blind detectionsbefore adjustment in this timing position is n, then c=n/N.

A tenth embodiment is described as follows.

When an uplink wideband component carrier (CC) is divided into amultiple of BWPs, depending on the resource allocation strategy of thebase station, interference scenarios on different BWPs can be different.For uplink control/data transmission, differences in interferencescenarios result in the changes in uplink transmission power of suitableUE. The UE can respectively process the uplink transmission powercontrol for each BWP; or, the UE can process the uplink transmissionpower control for a set of BWPs; or, the UE can still process the uplinktransmission power control using a CC as unit. For a UE, different BWPscan be configured with different services on one CC, and UE can processthe uplink transmission power by distinguishing BWPs, so that theprocesses of transmission power for different reliability requirementsof different services are achieved. On a CC, different BWPs can beconfigured to use different waveforms, that is, OFDM or OFDM of discretefourier transform spreading (DFT-S-OFDM), so that processes oftransmission power for different waveforms are achieved by processingthe uplink transmission power by distinguishing BWPs. On one CC,different BWPs can be configured to use different system parameters,such as, a subcarrier interval and/or slot length or the like, so thatthe processes of transmission power for different system parameters areachieved by processing the uplink transmission by distinguishing BWPs.

For BWP p, the uplink transmission power Pp(i) of the UE at TU i can bedetermined according to the following formula:P _(p)(i)=P _(O,p)+α_(p)·PL_(p) +f _(p)(i)+g(others).  (1)

Wherein, PO,p is a power offset parameter, which can further include twoparts, in other words, the PO,p is a sum of the cell-specific parameterPO_NOMINAL,p and the UE-specific parameter PO_UE,p, that is,PO,p=PO_NOMINAL,p+PO_UE,p·αp is a parameter that controls partial ortotal compensation for path loss PLp·fp(i) can refer to the accumulationof transmission power control commands (TPC) in order to achieveclosed-loop power control, or fp(i) can be a dynamically indicatedabsolute power adjustment value. g(others) is used to refer to otherparameters that affect the power control, which is not limited in thepresent invention. For uplink control channel (such as PUCCH) and uplinkdata channel (such as PUSCH), the above-described parameters can beconfigured and processed respectively.

The above-described parameters PO,p, PO_NOMINAL,p, PO_UE,p and/or αp canbe configured respectively for each BWP. Or, the above-describedparameters PO,p, PO_NOMINAL,p, PO_UE,p and/or ap can be configured for acarrier and apply to each BWP of the carrier. Or, the above-describedparameters PO,p, PO_NOMINAL,p, PO_UE,p and/or αp can also be configuredto be used for a set of BWPs. The above-described set of BWPs can belongto only a same carrier or can belong to a multiple of carriers.

The above-described parameter fp(i) can be processed respectively foreach BWP. Or, the above-described parameter fp(i) can be processed for acarrier, and can be used for each BWP of this carrier, for example, TPCfor controlling and transmitting data of all BWPs of one carrier can beaccumulated. Or, the above-described parameter fp(i) can also beconfigured and used for a set of BWPs. The above-described set of BWPscan belong to a same carrier only or can belong to a multiple ofcarriers. For example, TPC for the controlling and transmitting data ofthe above-described set of BWPs is accumulated.

For the above parameter PLp, it is necessary to determine a referencedownlink signal for measuring PLp. The reference downlink signal formeasuring PLp can be configured for each BWP respectively. Or, thereference downlink signal for measuring PLp can be configured for acarrier and is used for each BWP of this carrier. Or, the referencedownlink signal can be configured to be used for a set of BWPs, whereinthe above-described set of BWPs can belong to a same carrier only orbelong to a multiple of carriers. For a carrier, the above-describedreference downlink signal for measuring PLp can be a downlink signal inone BWP, for example, the above-described one BWP for measuring PLp canbe configured by a higher-layer, or, can be the BWP of a synchronizationchannel and/or a broadcast channel received by the UE. Or, theabove-described reference downlink signal for measuring PLp can also bemeasured based on downlink signals in one set of BWPs, wherein theabove-described set of BWPs can belong to a same carrier only or canbelong to a multiple of carriers. For example, the above-described setof BWPs for measuring PLp can be configured by a higher layer, or can beeach BWP in one carrier.

The transmission power determined according to the above equation (1)also needs to be further limited to the permissible maximum transmissionpower.

A first method is that, a total power of the PUCCH and PUSCH of a UE oneach BWP on one carrier c cannot exceed the maximum transmission powerPCMAX,c(i). The total transmission power of the PUCCH of the UE on eachBWP on the above-described carrier c can be

${P_{c}^{\prime}(i)} = {\min\left\{ \begin{matrix}{P_{{CMAC},c}(i)} \\{{10{\log_{10}\left( {\sum\;{{\hat{P}}_{p,c}(i)}} \right)}},}\end{matrix} \right.}$wherein, {circumflex over (P)}_(p,c)(i) is a linear value of PUCCHtransmission power Pp,c(i) on one BWP, and one or more BWPs of PUCCH canbe transmitted on one carrier c at the same time. When the UE does nottransmit the PUCCH on the carrier c, the total transmission power of thePUSCH of the UE on each BWP of the above-described carrier c is

${P_{c}^{\prime}(i)} = {\min\left\{ \begin{matrix}{P_{{CMAC},c}(i)} \\{{10{\log_{10}\left( {\sum\;{{\hat{P}}_{p,d}(i)}} \right)}},}\end{matrix} \right.}$wherein, {circumflex over (P)}_(p,d)(i) is a linear value of thetransmission power Pp,d(i) of the PUSCH on one BWP. When the UEtransmits the PUCCH on the carrier c, the total transmission power ofthe PUSCH of the UE on each BWP of the above-described carrier c is

${P_{c}^{\prime}(i)} = {\min\left\{ {\begin{matrix}{10{\log_{10}\left( {{{\hat{P}}_{{CMAX},c}(i)} - {{\hat{P}}_{PUCCH}(i)}} \right)}} \\{10{\log_{10}\left( {\sum{{\hat{P}}_{p,d}(i)}} \right)}}\end{matrix},} \right.}$wherein, {circumflex over (P)}_(CMAX,c)(i) is a linear value of the iPCMAX,c(i), {circumflex over (P)}_(PUCCH)(i) is a linear value of thesum of the powers of the PUCCHs of the UE on each BWP of the carrier c.

The UE can report a PHR respectively for each BWP. For a BWP, the UE canobtain the PHR according to the transmission power of PUCCH and PUSCH onthis BWP and the maximum transmission power PCMAX,c(i) of the carrier c.For a BWP, when no PUCCH exists, the PHR is the difference betweenPCMAX,c(i) and the transmission power Pp,d(i) of the PUSCH. For a BWP,when a PUCCH exists, one type of PHR is a difference between {tilde over(P)}_(CMAX,c)(i) and the transmission power Pp,d(i) of PUSCH, and {tildeover (P)}_(CMAX,c)(i) is the maximum transmission power withoutconsidering the influence of the PUCCH transmission. The other type ofPHR is a difference between PCMAX,c(i) and the total transmission power10 log₁₀({circumflex over (P)}_(p,c)(i)+{circumflex over (P)}_(p,d)(i))of PUCCH and PUSCH. For BWPs not transmitting PUSCH, the UE can report avirtual PHR, that is, to generate transmission power of PUCCH and PUSCHaccording to some configured or predefined parameters and calculates thePHR. Specifically, this method can be applied to a case that each BWP onthe carrier c is configured with the above-described power controlparameters, respectively.

The UE can report the PHR only for the carrier c. The UE can obtain thePHR according to the transmission power of PUCCH and PUSCH on thecarrier c and the maximum transmission power PCMAX,c(i) of the carrierc. When no PUCCH exists, the PHR is a difference between PCMAX,c(i) andthe transmission power 10 log₁₀(Σ{circumflex over (P)}_(p,d))) of PUSCH.When a PUCCH exists, one type of PHR is a difference between {tilde over(P)}_(CMAX,c)(i) and transmission power 10 log₁₀(Σ{circumflex over(P)}_(p,d)(i)) of PUSCH, wherein {tilde over (P)}_(CMAX,c)(i) is themaximum transmission power without considering the influence of PUCCHtransmission. The other type of PHR is a difference between PCMAX,c(i)and the total transmission power 10 log₁₀(Σ{circumflex over(P)}_(p,c)(i)+Σ{circumflex over (P)}_(p,d)(i)) of PUCCH and PUSCH. Whenthe carrier c does not schedule the PUSCH, the UE can report a virtualPHR, that is, UE generates a transmission power of the PUCCH and thePUSCH according to some configured or predefined parameters, andcalculates the PHR. Σ{circumflex over (P)}_(p,d)(i) is the sum of thetransmission powers of the PUSCHs scheduled on each BWP of the carrierc. Σ{circumflex over (P)}_(p,c)(i) is the sum of the transmission powersof the PUCCH scheduled on each BWP of the carrier c. Specifically, thismethod can be applied to a case of configuring a set of above-describedpower control parameters for the carrier c which is used for each BWP ofthe carrier c.

A second method is to configure the maximum transmission powerPCMAX,p(i) of the UE on each BWP so that the total power for controllingand transmitting data on the BWP p cannot exceed the maximumtransmission power PCMAX,p(i). The transmission power of the PUCCH ofthe UE on BWP p can be

${P_{p}^{\prime}(i)} = {\min\left\{ {\begin{matrix}{P_{{CMAX},p}(i)} \\{P_{p,c}(i)}\end{matrix},} \right.}$Pp,c(i) is the control channel transmission power calculated accordingto equation (1). When the UE does not transmit the control channel onBWP p, the transmission power of the PUSCH of the UE on BWP p is

${P_{p}^{\prime}(i)} = {\min\left\{ {\begin{matrix}{P_{{CMAX},p}(i)} \\{P_{p,d}(i)}\end{matrix},} \right.}$Pp,d(i) is the transmission power of PUSCH calculated according toequation (1). When a UE transmits a control channel on BWP p, thetransmission power of the PUSCH of the UE on BWP p is

${P_{p}^{\prime}(i)} = \left\{ {\begin{matrix}{10{\log_{10}\left( {{{\hat{P}}_{{CMAX},p}(i)} - {{\hat{P}}_{PUCCH}(i)}} \right)}} \\{P_{p,d}(i)}\end{matrix},} \right.$wherein, {circumflex over (P)}_(CMAX,p)(i) is a linear value ofPCMAX,p(i), {circumflex over (P)}_(PUCCH)(i) is a linear value of thepower of the control channel of the UE on BWP p.

Using this method, PHRs can be reported respectively for each BWP. For aBWP, when no PUCCH exists, the PHR is a difference between PCMAX,p(i)and the transmission power Pp,d(i) of PUSCH. For a BWP, when a PUCCHexists, one type of PHR is a difference between {tilde over(P)}_(CMAX,p)(i) and the transmission power Pp,d(i) of PUSCH, and {tildeover (P)}_(CMAX,p)(i) is the maximum transmission power withoutconsidering the influence of the PUCCH transmission. The other type ofPHR is a difference between PCMAX,p(i) and the sum of transmission powerPp,c(i) of PUCCH and the transmission power Pp,d(i) of PUSCH. For BWPsnot transmitting PUSCH, the UE can report a virtual PHR, that is, UEgenerates a transmission power of the PUCCH and the PUSCH according tosome configured or predefined parameters, and calculates the PHR.

A third method is to configure a set of BWPs. The total power forcontrolling and transmitting data of the UE on the above-described setof BWPs cannot exceed the maximum transmission power PCMAX,g(i). Thetotal transmission power of the control channel of the UE on theabove-described set of BWPs can be

${P_{g}^{\prime}(i)} = {\min\left\{ {\begin{matrix}{P_{{CMAX},g}(i)} \\{\sum{P_{p,c}(i)}}\end{matrix},} \right.}$wherein Pp,c(i) is a control channel transmission power on one BWP. Whenthe UE does not transmit the control channel on the above-described setof BWPs, the total transmission power of the data transmission of the UEon the above-described set of BWPs

${P_{g}^{\prime}(i)} = {\min\left\{ {\begin{matrix}{P_{{CMAX},g}(i)} \\{\sum{P_{p,d}(i)}}\end{matrix},} \right.}$is wherein Pp,d(i) is a data channel transmission power on one BWP. Whenthe UE transmits the control channel on the above-described set of BWPs,the total transmit power of the data transmission of the UE on theabove-described set of BWPs is

${P_{g}^{\prime}(i)} = {\min\left\{ {\begin{matrix}{10{\log_{10}\left( {{{\hat{P}}_{{CMAX},g}(i)} - {{\hat{P}}_{PUCCH}(i)}} \right)}} \\{\sum{P_{p,d}(i)}}\end{matrix},} \right.}$wherein {circumflex over (P)}_(CMAX,g)(i) is a linear value ofPCMAX,g(i), {circumflex over (P)}_(PUCCH)(i) is a linear value of thesum of the power of the UE on the control channel of the above-describedset of BWPs.

Corresponding to the above method, the present application furtherdiscloses an apparatus, which can be used to implement theabove-described method. As shown in FIG. 21, the apparatus comprises aphysical downlink control channel (PDCCH) detecting and parsing module,a physical downlink shared channel (PDSCH) receiving module, a physicaluplink control channel (PUCCH) generating module, and a transceivingmodule, wherein:

the PDCCH detecting and parsing module, configured to detect, by the UE,a downlink control information (DCI) for scheduling the PDSCH on aconfigured control resource set, and parse the detected DCI;

the PDSCH receiving module, configured to receive the PDSCH according tothe detected DCI;

the PUCCH generating module, configured to generate a PUCCH signal to befed back; and

the transceiving module is configured to receive a downlink signal froma base station and transmit a PUCCH signal.

A person skilled in the art can understand that all or part of the stepsborne in the methods of the above-described embodiments can beimplemented by a program instructing a relevant hardware. Said programcan be stored in a computer-readable storage medium, when executed, oneof the steps of the method embodiment or a combination thereof isincluded.

In addition, each of the functional units in the embodiments of thepresent application can be integrated into one processing module, oreach of the units can exist separately physically, or two or more unitscan be integrated into one module. The above-described integrated modulecan be implemented in the form of hardware or in the form of softwarefunction module. When side integrated module is implemented in the formof a software function module and is sold or used as an independentproduct, the integrated module can also be stored in a computer readablestorage medium.

The above-described storage medium can be a read only memory, a magneticdisk, an optical disk, or the like.

The above is only the preferred embodiments of the present applicationand is not intended to limit the present application. Any modifications,equivalent substitutions, improvements, etc. within the spirit andprinciple of the present application should be included in the presentapplication within the scope of protection.

To make the objectives, technical solutions, and advantages of thepresent invention more comprehensible, the present invention is furtherdescribed in detail below with reference to the accompanying drawingsand embodiments.

FIG. 22 is a flowchart of a method for transmitting data based onmultiple antenna ports according to the present invention. The methodincludes the following steps:

Step 2201: The UE detects scheduling assignments (SAs) of other UEswithin one time unit (TU) and generates a demodulation reference signal(DMRS) sequences of data channels which are scheduled by the correctlydecoded SAs.

The above TU can refer to a subframe, a slot or a mini-slot. A mini-slotcontains one or more orthogonal frequency division multiplexing (OFDM)symbols. For example, the TU in the LTE V2X system is a subframe.

Step 2202: The UE measures received power of the data channels accordingto the DMRS sequences.

The present invention provides the following two specific embodiments toelaborate the process for transmitting data based on multiple antennaports of the present invention.

An eleventh embodiment is described as follows.

For a UE configured with multiple antennas, the UE can transmit databased on two antenna ports (hereinafter referred to as an MUE). It isassumed that the MUE transmits two DMRS ports, for example, by employingthe transmit diversity techniques based on space time block coding(STBC), space frequency block coding (SFBC), or large-delay channeldelay diversity (CDD) and the like. Correspondingly, it is necessary todefine DMRS sequences of two ports. It is assumed that the two DMRSports are multiplexed in the manner of code division multiplexing (CDM).The DMRS sequence can be determined by three parameters, that is, a rootsequence, a cyclic shift (CS) and an orthogonal cover code (OCC). Forone above MUE, the root sequences with the two DMRS ports can be thesame, that is, the DMRS sequences are distinguished depending on the CSand/or OCC, in this case, the DMRS sequences of the two DMRS ports areorthogonal, which is beneficial to ensure the channel estimationaccuracy.

The UE in the version 14 of LTE (hereinafter referred to as an SUE)transmits PSCCH and PSSCH through a single antenna port.Correspondingly, the SUE also measures the PSSCH-RSRP according to theDMRS only on the time-frequency resources of the single antenna port,which thereby to be used for processing the resource selection. It isassumed that an interference UE is an MUE, in order for the SUE tomeasure the PSSCH-RSRP of the MUE, the time-frequency resource of theDMRS of the MUE is the same as that of the SUE; and the DMRS sequence ofat least one DMRS port of the MUE is the same as that of the SUE. Inorder to optimize the performance of resource selection, it is necessaryto ensure that the PSSCH-RSRP measured by the SUE reflects the totalpower of the MUE on the two antenna ports.

One method for generating the DMRS sequences of the two DMRS ports ofMUE is to distinguish the two ports only according to two OCCs if theroot sequence and CS are identical. As shown in FIG. 23, it is assumedthat there are two DMRS symbols in a TU, and the two DMRS portsrespectively employ different OCCs of length 2, for example, [1,1] and[1,−1]. It is assumed that there are 4 DMRS symbols in a TU, the twoDMRS ports respectively employ different OCCs of length 4. For example,in the LTE V2X system, two OCC codes of length 4 are defined as[1,1,1,1] and [1,−1,1,−1], and the above two OCCs ensure that OCCelements on any two adjacent DMRS symbols are orthogonal. As shown inFIG. 2, on a DMRS symbol, DMRS sequences of two DMRS ports withoutconsidering the influence of OCC both are

$\frac{P}{\sqrt{2}},$according to the same root sequence and CS, wherein the coefficients

$\frac{1}{\sqrt{2}}$are used for normalizing the power of the two antenna ports. It isassumed that the OCC elements of the two antenna ports are a and brespectively, wherein a and b are the same or different, for example,the values of a and b are 1 or −1, the signals of the two antenna portson this DMRS symbol are

${{h_{1} \cdot a \cdot \frac{P}{\sqrt{2}}}\mspace{14mu}{and}\mspace{14mu}{h_{2} \cdot b \cdot \frac{P}{\sqrt{2}}}},$wherein, h1 and h2 are the channel gains of the two antenna portsrespectively, and the superimposed signal is

${h_{1} \cdot a \cdot \frac{P}{\sqrt{2}}} + {{h_{2} \cdot b \cdot \frac{P}{\sqrt{2}}}\;{(2301).}}$For convenience of analysis, it is assumed that the channel gains of twoDMRS symbols are constant. Assuming that the OCC elements of the twoantenna ports on the next adjacent DMRS symbol are a and −brespectively, the superimposed signal is

${h_{1} \cdot a \cdot \frac{P}{\sqrt{2}}} - {{h_{2} \cdot b \cdot \frac{P}{\sqrt{2}}}\;{(2302).}}$The RSRP measured by the SUE on the above two DMRS symbols will beanalyzed below. It is assumed that RSRP is measured in each DMRS symbolfirst and then the RSRP of two DMRS symbols are averaged, then,

$\begin{matrix}{{RSRP}_{TXD} = \frac{\begin{matrix}{{{\left( {{h_{1} \cdot a \cdot \frac{P}{\sqrt{2}}} + {h_{2} \cdot b \cdot \frac{P}{\sqrt{2}}}} \right) \cdot P^{*}}}^{2} +} \\{{\left( {{h_{1} \cdot a \cdot \frac{P}{\sqrt{2}}} - {h_{2} \cdot b \cdot \frac{P}{\sqrt{2}}}} \right) \cdot P^{*}}}^{2}\end{matrix}}{2}} \\{= \frac{{{{h_{1} \cdot a} + {h_{2} \cdot b}}}^{2} + {{{h_{1} \cdot a} - {h_{2} \cdot b}}}^{2}}{4}} \\{= \frac{{\left( {{h_{1} \cdot a} + {h_{2} \cdot b}} \right) \cdot \left( {{h_{1} \cdot a} + {h_{2} \cdot b}} \right)^{*}} + {\left( {{h_{1} \cdot a} - {h_{2} \cdot b}} \right) \cdot \left( {{h_{1} \cdot a} - {h_{2} \cdot b}} \right)^{*}}}{4}} \\{= \frac{\begin{matrix}{{h_{1}}^{2} + {h_{2}}^{2} + {h_{1} \cdot a \cdot h_{2}^{*} \cdot b^{*}} + {h_{2} \cdot b \cdot h_{1}^{*} \cdot a^{*}} + {h_{1}}^{2} + {h_{2}}^{2} - {h_{1} \cdot}} \\{{a \cdot h_{2}^{*} \cdot b^{*}} - {h_{2} \cdot b \cdot h_{1}^{*} \cdot a^{*}}}\end{matrix}}{4}} \\{= \frac{{h_{1}}^{2} + {h_{2}}^{2}}{2}}\end{matrix}$

For the above analysis, the RSRP measured by the SUE can actuallyrepresent the average power of the two DMRS ports of the MUE, althoughthe SUE does not know that the measured MUE employs two DMRS ports totransmit data. Particularly, the value of the measurement of the RSRPdoes not have a deviation of 3 dB relative to the true value, therefore,the resource selection based on RSRP can be effectively supported.

DMRS ports can only use two OCCs, for example, OCCs [1,1] and [1,−1] oflength 2; in the LTE V2X system, two OCC codes of length 4 are defined,that is, [1,1,1,1] and [1,−1,1,−1]. For the MUE, a specific method toindicate one OCC to be used for one DMRS port (e.g., port 0) and theother OCC to be used for the other DMRS port (e.g., port 1) can beemployed. It is assumed that the UE generates a DMRS sequence accordingto the information X, for example, X is the CRC of the received SA, andthe root sequence, CS and OCC of the port 0 are determined according toX, while the above port 1 employs the same root sequence and CS, anduses the other OCC. Or, since an MUE occupies the above two OCCs, thetwo OCCs can be determined according to the fixed mapping relation ofthe OCC to DMRS ports. For example, the root sequence and CS of DMRSsequences are determined according to X, and [1,1] is used for DMRS port0 and [1,−1] is used for DMRS port 1. Or, one of the above two OCCs canbe used for one DMRS port (e.g., port 0) and one of the other two OCCsof length 4 can be used for the other DMRS port (e.g., port 1). DMRSports can actually use four OCCs. The two OCCs and the other two OCCsmentioned above can be mapped one by one. For example, the other DMRScan employ OCC [1,−1,−1,1] to correspond to [1,1,1,1]; the other DMRScan employ OCC [1,1,−1,−1] to correspond to [1, −1, 1, −1]. For example,the root sequence, CS and OCC of the above port 0 is determinedaccording to X. The above port 1 employs the same root sequence and CSand one OCC mapping to the OCC of port 0. In this way, the collisionprobability with the DMRS sequence of the UE for transmitting data witha single port will not be increased.

For this mechanism of generating DMRS sequences, one method formeasuring RSRP is to first measure RSRP in each DMRS symbol in a TUrespectively and then to obtain RSRP of the whole TU according to RSRPof each DMRS symbol, for example, the method for processing RSRP ofmultiple DMRSs is to take the average. In this way, the sequences on oneDMRS symbol without considering the influence of OCC are the sameaccording to the same root sequence and CS, for example, the sequencesare denoted as

$\frac{P}{\sqrt{2}},$wherein the coefficient

$\frac{1}{\sqrt{2}}$is used for normalizing the power of the two antenna ports, therefore,the role of OCC is equivalent to pre-code the two antenna ports so as tomake them equal to one DMRS port. It is assumed that the OCC elements ofthe two antenna ports on a DMRS symbol are a and b, respectively, thenthe pre-coded vector is [a,b]. Since the DMRS sequences of two DMRSports of the MUE is equivalent to one DMRS port, it is regarded as thatthe SUE is measuring the RSRP of the above equivalent DMRS port,therefore, the value of the measurement of the RSRP is accurate, thatis, the SUE can accurately measure and obtain the total energy of twoDMRS ports, so as to effectively support resource selection.

Based on the above analysis, only one DMRS port can be defined when theDMRS is defined based on the data transmission of the two antenna ports.It is assumed that the UE generates the DMRS sequence according toinformation X, for example, X is a CRC of the received SA, the rootsequence and CS of the DMRS port can be determined according to X, thena sequence P is generated according to the root sequence and CS, and forthe above each DMRS symbol of the DMRS port, the sequence P is pre-codedrespectively. For example, it is assumed that the two OCCs are [1,1,1,1]and [1,−1,1,−1], the pre-coded vectors of the four DMRS symbols are[1,1], [1,−1], [1,1] and [1,−1].

Another method for generating the DMRS sequences of the two DMRS portsof MUE is to distinguish the two ports only according to CS while theroot sequence and OCC are the identical. It is assumed that the UEgenerates the DMRS sequence according to information X, for example, Xis a CRC of the received SA, the root sequence, CS and OCC of a DMRSport can be determined firstly according to X, wherein the CS is denotedas cs0, then the other DMRS port employs the same root sequence and OCC,and the CS thereof is determined according to cs0 or X. The CS of theother DMRS port can be equal to cs0 adding with a shift d, that is, theCS of the other port can be (cs0+d) mod 12, for example, d=6, 4, 3, 2.Or, the CS of the other DMRS port can be (cs0 mod 4+8) mod 12. Or, theCS of the other DMRS port can be Ccs0 mod 4, wherein, C={8, 9, 10, 11},or C={1,5,7,11}. Or, the CS of the other port can be C_(└X/2┘ mod 4),wherein, C={8, 9, 10, 11}, or C={1,5,7,11}. Or, the CS of the other portcan be C_(└X/16┘ mod 4), wherein, C={8, 9, 10, 11}, or C={1,5,7,11}.With respect to the present system, the above three methods can increasethe number of orthometric DMRS sequences, so as to reduce thepossibility of different MUEs selecting a same DMRS sequence.

In the frequency domain, the change of CS has an influence on the phasechange on each subcarrier. For example, if the CS intervals are 6, 4,and 3 corresponding to two DMRS ports, the change period of the phasedifference between the two DMRS ports is 2, 3, 4. In this way, the phasedifferences between the two DMRS ports are different on adjacentsubcarriers, so RSRP cannot be measured in combination of the adjacentsubcarriers. Because the change of the phase difference is periodic, thesubcarriers can be divided into k groups according to the interval k,that is, the jth group includes subcarrier j+k·c, wherein, c=0,1, . . .,j=0,1, . . . k−1. k is equal to 2, 3, 4, if CS intervals correspondingto two DMRS ports are 6, 4 and 3, thereby RSRP can be measured andaveraged separately for each group of subcarriers.

The mechanism for generating a DMRS sequence can be that: RSRP ismeasured in each DMRS symbol firstly, that is, RSRP are respectivelymeasured and then averaged on the k groups of subcarriers, and then RSRPof multiple DMRS symbols are averaged. Or, RSRP can also be measured oneach group of subcarriers of multiple DMRS symbols, and then the RSRPare averaged. Or, since the phases of the two DMRS ports correspondingto the same subcarrier are the same on different DMRS symbols, RSRP canbe measured on all the subcarriers jointly with two adjacent DMRSsymbols. In this way, the RSRP measured by the SUE can actuallyrepresent the average power of the two DMRS ports of the MUE althoughthe SUE does not know that the measured MUE employs two DMRS ports totransmit data. In particular, there is no deviation of 3 dB relative tothe true value of the above value of the measurement of the RSRP, so theresource selection based on RSRP can be effectively supported.

A twelfth embodiment is described as follows.

In the LTE V2X system, the randomization of the DMRS sequence andscrambling code of the data channel are achieved by using the CRC fieldof the SA. The value of the above CRC depends on all the informationfields of the SA, that is, as long as a bit changes, regardless of theposition of the changed bit, it will lead to the change of CRC.Therefore, CRC can better reflect the difference of SA information ofdifferent devices, which is beneficial to randomize the DMRS sequenceand scrambling code. However, the same CRC value can be obtained whenthe SA information varies by more than one bit and the changed bit isconsistent with the generator polynomial of CRC, but the probability ofthis case is relatively small. The UE processes the randomization of theDMRS sequence and the scrambling code according to the information X. Xcan be the CRC field of the SA, or X can also be an information field(for example, in LTE D2D, a Destination Group ID contained in the SA)contained in the SA for randomization, or X is determined by othermethods.

When a UE transmits data by employing a single antenna port, the UEoccupies only one of all possible DMRS sequences, and when the UEtransmits by employing dual antenna ports, such as a transmit diversitytechnology, the UE simultaneously occupies two of all possible DMRSsequences. This may possibly result in reducing the randomization effectof DMRS sequences and scrambling codes between UEs. The DMRS sequencecan be determined by three parameters, that is, the root sequence, thecyclic shift (CS) and the orthogonal cover code (OCC). For example, itis assumed that a bit of X (for example, X mod 2) is only used fordetermining OCC but not for determining the root sequence and CS, theabove bit of X (X mod 2) cannot randomize DMRS sequences for differentUEs, when two DMRS ports of one UE employ two OCCs and employ the sameroot sequence and CS. In general, it is assumed that if bits in a subsetK of the bits of X are changed and all other bits are constant,correspondingly generated multiple DMRS sequences are all used for thesame UE, and K can include one or more bits, then the bits in the subsetK lose the function of randomizing DMRS sequences of different UEs. Inorder to ensure the performance of randomness, it is necessary to avoidor minimize the above situations when the DMRS sequence is generatedaccording to X. Preferably, multiple DMRS ports occupied by one UEemploy the same root sequence. The method of the present invention isdescribed below according to different combinations of CS and OCCrespectively.

The multiple DMRS ports occupied by one UE employ the same CS butdifferent OCCs

As shown in FIG. 3, the bits in a subset Y of the X are used fordetermining OCC (2401), wherein, Y includes one or more bits, meanwhilethe bits in the subset Y can be used for determining CS (2402). The DMRSsequences determined according to the subset Y are not completelyoccupied by a same UE, since Y affects the value of CS and multiple DMRSsequences occupied by one UE must employ the same CS.

For example, a bit X mod 2 of X is used for determining the OCC of theDMRS; bits X mod 2a whose number is a including the bit X mod 2 is fordetermining the CS of the DMRS, for example, CS is equal to (X mod2a)mod 12 or (└X/2┘ mod 2^(a−1)+X mod 2)mod 12, so that CS is a randomselection within the range [0,11], and the change of the bit X mod 2 ofX also affect CS, result in the increasing of the randomness of theDMRS; other bits └X/2^(a)┘ are used for obtaining the sequence shiftparameter f_(ss)=└X/2^(a)┘ mod 30 and fss is used for determining theroot sequence of the DMRS. Wherein, a can be configured, preconfigured,or predefined by a base station, for example, a is equal to 8.

For example, the OCC of the DMRS is determined according to one bit Xmod 2 of X; bits including bit X mod 2 are used for determining the CSof the DMRS, for example, CS is equal to X mod 12 or (└X/2┘+X mod 2)mod12, so that the CS is a random selection within the range [0,11], andthe change of bit X mod 2 of X also affect CS, result in the increasingof the randomness of DMRS; the sequence shift parameter is donated asf_(ss)=└X/2^(y)┘ mod 30. Wherein, y can be configured, preconfigured, orpredefined by the base station, for example, y is equal to 4 or 0. Forexample, the above 16-bit CRC directly replaces the destination group IDfor generating the scrambling code.

The multiple DMRS ports occupied by a UE use the same OCC but differentCSs

As shown in FIG. 25, the bits of the subset Y of X are used fordetermining CS (2501), wherein, Y includes one or more bits, meanwhilethe bits of Y can also be used for determining OCC (2502). The DMRSsequence determined according to the subset Y is not completely occupiedby the same UE, since Y affects the value of OCC and multiple DMRSsequences occupied by one UE must employ the same OCC. In fact, thenumber of CSs supported by the system can be relatively large, forexample, 12 CSs, while one UE occupies only part of CSs, for example, 2CSs. It is assumed that the bits of a subset z of Y change while theother bits of Y are constant, the generated CSs are completely occupiedby the same UE, and the bits of z can also be used for determining theOCCs simultaneously. The DMRS sequence determined according to Y is notcompletely occupied by the same UE, since z affects the value of OCC andmultiple DMRS sequences occupied by one UE must use the same OCC.

For example, it is assumed that the 3 bits [X/2]mod 8 of the X denotedas b3, b2, b1 are only used for generating only 8 CSs, that is, 0, 2, 3,4, 6, 8, 9, 10, wherein the value of b3 determines whether the generatedCSs are 0, 2, 3, 4, or 6, 8, 9, 10, in other words, the function of b3is to generate CS with interval 6. It is assumed that the CS interval oftwo DMRS ports occupied by one UE is 6, b3 cannot randomize the DMRSsequences of multiple UEs. b3 and the bits X mod 2 of X can be used forgenerating OCC, for example the OCC is equal to b3+X mod 2. The otherbits └X/16┘ are used for obtaining the sequence shift parameterf_(ss)└X/16┘ mod 30.

For example, a bits └X/2┘ mod 2^(a) of X, denoted as ba, . . . , b3, . .. , b2, . . . , b1, which is used for determining the CS of DMRS, forexample, CS is equal to (└X/2┘ mod 2^(a))mod 12. In this way, no CSgenerated by one or more bits is completely used for multiple DMRS portsof a UE, so bits [X/2] mod 2^(a) of X can uniquely be used forgenerating CSs. The bits X mod 2 of X can be used for generating OCC,for example, OCC is equal to X mod 2. The other bits └X/2_(a+1)┘ areused for obtaining the sequence shift parameter f_(ss)=└X/2^(a+1)┘ mod30. Wherein, a can be configured, preconfigured, or predefined by a basestation, for example, a is equal to 7. Or, the bits └X/2^(y)┘ of X areused for obtaining the sequence shift parameter f_(ss)=└X/2^(y)┘ mod 30.Wherein, y can be configured, preconfigured, or predefined by a basestation, for example, y is equal to 8.

The multiple DMRS ports occupied by a UE employ different OCCs anddifferent CSs

The bits of the subset Y of X can only be used for determining CS or fordetermining the OCC, and Y includes one or more bits. The DMRS sequencedetermined according to the subset Y is not completely occupied by thesame UE, since Y only affects CS or only affects OCC and multiple DMRSsequences occupied by one UE employ different CSs and different OCCs.

For example, one bit X mod 2 of X is used for determining the OCC of theDMRS; 3 bits └X/2┘ mod 8 are used for determining the CS of the DMRS,wherein, CS can be equal to └X/2┘ mod 8, or CS can also be eight valueswithin the CS range [0,11] mapped from eight values of └X/2┘ mod 8, forexample, the mapped CSs are as 0, 2, 3, 4, 6, 8, 9, 10 in sequence, orCS is equal to └X/2┘ mod 12, such that CSs are randomly selected withinthe range [0,11] result in the increasing of the randomness of DMRS; thesequence shift parameter is denoted as f_(ss)=└X/2^(y)┘ mod 30. Wherein,y can be configured, preconfigured, or predefined by the base station,for example, y is equal to 4 or 0. Taking the bit X mod 2 as an example,when only the bit X mod 2 changes, the CSs of the generated DMRSsequences are the same, and the OCCs are different. The bit X mod 2 canimplement the randomization of DMRS sequences for different UEs, sincetwo DMRS ports occupied by one UE must employ different CSs anddifferent OCCs.

Corresponding to the above method, the present application furtherdiscloses a device, which can be used for implementing the above method.As shown in FIG. 26, the device includes a demodulation reference signal(DMRS) generating module and a reference signal received power (RSRP)measuring module, wherein:

the DMRS generating module is configured for detecting schedulingassignments (SAs) of other user equipment (UEs) by a UE in a time unit(TU), generating DMRS sequences of data channels, which are scheduled bythe correctly decoded SAs; and

the RSRP measuring module is configured for measuring RSRP of the datachannels by the UE according to the DMRS sequences.

In a preferred embodiment of the present invention, wherein, if one UEoccupies two DMRS ports, the DMRS generating module is configured forgenerating two DMRS sequences, wherein, root sequences and cyclic shifts(CSs) of the two DMRS sequences are the same, orthogonal cover codes(OCCs) of the two DMRS sequences are different.

In another preferred embodiment of the present invention, wherein, ifthe DMRS ports use four OCCs, the DMRS generating module is configuredfor determining a first OCC and applying the first OCC to one DMRS port,and applying a second OCC to the other DMRS port according to cyclicredundancy checks (CRCs) of the SAs, wherein, the second OCC is the OCCwhich is mapped to the first OCC.

In another preferred embodiment of the present invention, wherein, ifthe DMRS ports only occupy two OCCs, the DMRS generating module isconfigured for determining one OCC which is used for one DMRS port andthe other OCC which is used for the other DMRS port, according to cyclicredundancy checks (CRCs) of the SAs; or, determining OCCs used for thetwo DMRS, according to a mapping relation from the OCCs to the DMRSports.

A person of ordinary skill in the art may understand that all or part ofthe steps carried in the methods in the foregoing embodiments may beimplemented by a program instructing relevant hardware. The program maybe stored in a computer-readable storage medium, when executed theprogram, one of the steps of the method embodiment or a combinationthereof is included.

In addition, each of the functional units in the embodiments of thepresent application may be integrated into one processing module, oreach of the units may exist separately physically, or two or more unitsmay be integrated into one module. The above-mentioned integrated modulecan be implemented in the form of hardware or in the form of softwarefunctional module. When the integrated module is implemented in the formof a software function module and is sold or used as an independentproduct, the integrated module may also be stored in a computer readablestorage medium.

The above-mentioned storage medium may be a read only memory, a magneticdisk, an optical disk, or the like.

The above is only the preferred embodiments of the present applicationand is not intended to limit the present application. Any modifications,equivalent substitutions, improvements, etc. within the spirit andprinciple of the present application should be included in the scope ofprotection of the present application.

Methods according to embodiments stated in claims and/or specificationsof the disclosure may be implemented in hardware, software, or acombination of hardware and software.

When the methods are implemented by software, a computer-readablestorage medium for storing one or more programs (software modules) maybe provided. The one or more programs stored in the computer-readablestorage medium may be configured for execution by one or more processorswithin the electronic device. The at least one program may includeinstructions that cause the electronic device to perform the methodsaccording to various embodiments of the disclosure as defined by theappended claims and/or disclosed herein.

The programs (software modules or software) may be stored innon-volatile memories including a random access memory and a flashmemory, a read only memory (ROM), an electrically erasable programmableread only memory (EEPROM), a magnetic disc storage device, a compactdisc-ROM (CD-ROM), digital versatile discs (DVDs), or other type opticalstorage devices, or a magnetic cassette. Alternatively, any combinationof some or all of the may form a memory in which the program is stored.Further, a plurality of such memories may be included in the electronicdevice.

In addition, the programs may be stored in an attachable storage devicewhich is accessible through communication networks such as the Internet,Intranet, local area network (LAN), wide area network (WAN), and storagearea network (SAN), or a combination thereof. Such a storage device mayaccess the electronic device via an external port. Further, a separatestorage device on the communication network may access a portableelectronic device.

In the above-described detailed embodiments of the disclosure, acomponent included in the disclosure is expressed in the singular or theplural according to a presented detailed embodiment. However, thesingular form or plural form is selected for convenience of descriptionsuitable for the presented situation, and various embodiments of thedisclosure are not limited to a single element or multiple elementsthereof. Further, either multiple elements expressed in the descriptionmay be configured into a single element or a single element in thedescription may be configured into multiple elements.

While the disclosure has been shown and described with reference tocertain embodiments thereof, it will be understood by those skilled inthe art that various changes in form and details may be made thereinwithout departing from the scope of the disclosure. Therefore, the scopeof the disclosure should not be defined as being limited to theembodiments, but should be defined by the appended claims andequivalents thereof.

Although the disclosure has been described with an exemplary embodiment,various changes and modifications may be suggested to one skilled in theart. It is intended that the disclosure encompass such changes andmodifications as fall within the scope of the appended claims.

The invention claimed is:
 1. A first terminal in a wirelesscommunication system, the first terminal comprising: a transceiver; andat least one processor operably coupled to the transceiver, wherein theat least one processor is configured to: receive control information ona physical sidelink control channel (PSCCH) for a second terminal,wherein the control information includes information on resources for aphysical sidelink shared channel (PSSCH) scheduled by the PSCCH,identify a reference signal received power (RSRP) of the PSSCH, identifya resource set for a data transmission based on comparing the RSRP and athreshold, and transmit data based on the resource set, wherein thethreshold is identified based on a length of a transmission timeinterval (TTI) of the PSSCH among a plurality of TTIs.
 2. The firstterminal of claim 1, wherein the at least one processor is furtherconfigured to: divide a long TTI (lTTI) into multiple short TTIs(sTTIs), set an automatic gain control (AGC) at a beginning of eachsTTI, and set a gap at an end of each sTTI, wherein a length of the AGCof each sTTI is equal to a length of the AGC of the lTTI and a length ofthe gap of each sTTI is equal to a length of the gap of the lTTI, orwherein a length of the AGC of a first sTTI is equal to the length ofthe AGC of the lTTI, a length of the gap of a last sTTI is equal to thelength of the gap of the lTTI, and the length of AGC or gap of each ofother sTTIs is shorter than the length of the AGC or the gap of thelTTI, or wherein lengths of the AGC and the gap of each of other sTTIsare shorter than lengths of the AGC and the gap of the lTTIrespectively.
 3. The first terminal of claim 2, wherein the at least oneprocessor is further configured to: based on a number of schedulingassignments (SAs) that can be sensed by the second terminal beingsmaller than a total number of SAs of multiple TTIs with differentlengths in a lTTI, determine to-be-sensed SA resources according topriorities of the TTIs with different lengths, and based on the numberof SAs that can be sensed by the second terminal being smaller than thetotal number of SAs of multiple TTIs with different lengths in the lTTI,determine a number of SA resources of lTTI to be sensed by the secondterminal and a number of SA resources of sTTI to be sensed by the secondterminal respectively.
 4. A method performed by a first terminal, themethod comprising: receiving control information on a physical sidelinkcontrol channel (PSCCH) for a second terminal, wherein the controlinformation includes information on resources for a physical sidelinkshared channel (PSSCH) scheduled by the PSCCH; identifying a referencesignal received power (RSRP) of the PSSCH; identifying a resource setfor a data transmission based on a comparison of the RSRP and athreshold; and transmitting data based on the resource set, wherein thethreshold is identified based on a length of a transmission timeinterval (TTI) of the PSSCH among a plurality of TTIs.
 5. The method ofclaim 4, further comprising: dividing a long TTI (lTTI) into multipleshort TTIs (sTTIs); setting an automatic gain control (AGC) at abeginning of each sTTI; and setting a gap at an end of each sTTI,wherein a length of the AGC of each sTTI is equal to a length of the AGCof the lTTI and a length of the gap of each sTTI is equal to a length ofthe gap of the lTTI, or wherein a length of the AGC of a first sTTI isequal to the length of the AGC of the lTTI, a length of the gap of alast sTTI is equal to the length of the gap of the lTTI, and the lengthof AGC or gap of each of other sTTIs is shorter than the length of theAGC or the gap of the lTTI, or wherein lengths of the AGC and the gap ofeach of other sTTIs are shorter than lengths of the AGC and the gap ofthe lTTI respectively.
 6. The method of claim 5, wherein determining ofresources for data transmission comprises: based on a number ofscheduling assignments (SAs that can be sensed by the second terminalbeing smaller than a total number of SAs of multiple TTIs with differentlengths in a lTTI, determining to-be-sensed SA resources according topriorities of the TTIs with different lengths; and based on the numberof SAs that can be sensed by the second terminal being smaller than thetotal number of SAs of multiple TTIs with different lengths in the lTTI,determining a number of SA resources of lTTI to be sensed by the secondterminal and a number of SA resources of sTTI to be sensed by the secondterminal respectively.
 7. The first terminal of claim 1, wherein, basedon the RSRP of the PSSCH is less than or equal to the threshold, theresource set for the data transmission includes the resources for thePSSCH, wherein, based on the RSRP of the PSSCH is more than thethreshold, the resource set for the data transmission excludes theresources for the PSSCH.
 8. The first terminal of claim 1, wherein thedata is transmitted on a subset of the resource set, wherein the subsetis identified based on a length of a TTI for the data transmission. 9.The first terminal of claim 1, wherein the control information isreceived based on lengths of the plurality of TTIs.
 10. The method ofclaim 4, wherein, based on the RSRP of the PSSCH is less than or equalto the threshold, the resource set for the data transmission includesthe resources for the PSSCH, and wherein, based on the RSRP of the PSSCHis more than the threshold, the resource set for the data transmissionexcludes the resources for the PSSCH.
 11. The method of claim 4, whereinthe data is transmitted on a subset of the resource set, and wherein thesubset is identified based on a length of a TTI for the datatransmission.
 12. The method of claim 4, wherein the control informationis received based on lengths of the plurality of TTIs.